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Subject: Neural Stem Cells: An Overview -- Galli et al. 92 (6): 598 -- Circulation Research
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</TD></TR></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE><FONT=20
size=3D-1>(<EM>Circulation Research.</EM> 2003;92:598.)<BR>=A9 2003 =
American Heart=20
Association, Inc. </FONT><BR>
<TABLE cellSpacing=3D0 cellPadding=3D0>
  <TBODY>
  <TR>
    <TD>
      <HR noShade SIZE=3D1>
    </TD></TR>
  <TR>
    <TD>
      <H3>Review</H3></TD></TR></TBODY></TABLE>
<H2>Neural Stem Cells </H2>
<H3>An Overview </H3></NOBR><NOBR>Rossella Galli</NOBR>, <NOBR>Angela=20
Gritti</NOBR>, <NOBR>Luca Bonfanti</NOBR>, <NOBR>Angelo Luigi =
Vescovi</NOBR>=20
<BR>
<P><FONT size=3D-1>From the Stem Cell Research Institute (R.G., A.G., =
A.L.V.),=20
DIBIT, Hospital San Raffaele, Milan, Italy; and the Department of =
Veterinary=20
Morphophysiology (L.B.), Rita Levi Montalcini Center for Brain Repair,=20
University of Turin, Grugliasco, Italy. </FONT>
<P>
<P><FONT size=3D-1>Correspondence to Angelo Luigi Vescovi, Stem Cell =
Research=20
Institute, DIBIT, Hospital San Raffaele, Via Olgettina 58, Milan, Italy, =
20132.=20
E-mail <SPAN id=3Dem0>vescovi.angelo{at}hsr.it</SPAN>
<SCRIPT type=3Dtext/javascript><!--=0A=
 var u =3D "vescovi.angelo", d =3D "hsr.it"; =
document.getElementById("em0").innerHTML =3D '<a href=3D"mailto:' + u + =
'@' + d + '">' + u + '@' + d + '<\/a>'//--></SCRIPT>
</FONT>
<P><A name=3DABS><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D* hspace=3D5 =
src=3D"http://circres.ahajournals.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Abstract </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#top"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><IMG height=3D9 alt=3D* hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Abstract</FONT><BR><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#BDY"><IM=
G=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC1"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>The Forebrain Subventricular...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC2"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>The Nature and Origin...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC3"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Ex Vivo Behavior of...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC4"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Plasticity of NSCs Within...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC5"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Plasticity of NSCs Outside...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC6"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Conclusions<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#BIBL"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>T=
his=20
review focuses on the nature and functional properties<SUP> </SUP>of =
stem cells=20
of the adult mammalian central nervous system<SUP> </SUP>(CNS). It has =
recently=20
been shown that cell turnover, including<SUP> </SUP>neurons, does occur =
in the=20
mature CNS, thanks to the persistence<SUP> </SUP>of precursor cells that =
possess=20
the functional characteristics<SUP> </SUP>of bona-fide neural stem cells =
(NSCs)=20
within restricted brain<SUP> </SUP>areas. We discuss how the =
subventricular zone=20
of the forebrain<SUP> </SUP>(SVZ) is the most active neurogenetic area =
and the=20
richest source<SUP> </SUP>of NSCs. These NSCs ensure a life-long =
contribution of=20
new neurons<SUP> </SUP>to the olfactory bulb and, when placed in =
culture, can be=20
grown<SUP> </SUP>and extensively expanded for months, allowing the=20
generation<SUP> </SUP>of stem cell lines, which maintain stable and =
constant=20
functional<SUP> </SUP>properties. A survey of the differentiation =
potential of=20
these<SUP> </SUP>NSCs, both in vitro and in vivo, outlines their extreme =

plasticity<SUP> </SUP>that seems to outstretch the brain boundaries, so =
that=20
these<SUP> </SUP>neuroectodermal stem cells may give rise to cells that=20
derive<SUP> </SUP>from developmentally distinct tissues. A critical=20
discussion<SUP> </SUP>of the latest, controversial findings regarding =
this=20
surprising<SUP> </SUP>phenomenon is provided.<SUP> </SUP>
<P><BR><STRONG>Key Words:</STRONG> stem cells =95 transdifferentiation =
=95=20
neurogenesis</STRONG>
<P><A name=3DBDY><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D* hspace=3D5 =
src=3D"http://circres.ahajournals.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Introduction </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#top"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#ABS"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><IMG height=3D9 alt=3D* hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Introduction</FONT><BR><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC1"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>The Forebrain Subventricular...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC2"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>The Nature and Origin...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC3"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Ex Vivo Behavior of...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC4"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Plasticity of NSCs Within...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC5"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Plasticity of NSCs Outside...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC6"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Conclusions<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#BIBL"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>T=
he=20
nervous tissue, particularly that of the central nervous<SUP> =
</SUP>system=20
(CNS), is endowed with several peculiar characteristics<SUP> </SUP>that =
make it=20
unique among the other bodily tissues. Ultimately,<SUP> </SUP>these =
properties=20
relate to the CNS heterogeneous cell composition<SUP> </SUP>that =
underlies the=20
elaboration of an enormous amount of information<SUP> </SUP>into a =
complex=20
output. Historically, this complexity has been<SUP> </SUP>seen =
inextricably=20
linked to the lack of any cell turnover in<SUP> </SUP>the adult =
brain.<SUP>=20
</SUP>
<P>The dogmatic view of an ever-immutable neural tissue in mammals<SUP> =
</SUP>is=20
now been replaced by the notion that cell replacement occurs<SUP> =
</SUP>within=20
specific brain regions throughout adulthood. This continuous<SUP>=20
</SUP>neurogenetic process is sustained by the life-long =
persistence<SUP>=20
</SUP>of neural stem cells (NSCs) within restricted CNS areas.<SUP> =
</SUP>
<P>In the adult mammalian brain, the genesis of new neurons has<SUP> =
</SUP>been=20
consistently documented in the subgranular layer of the<SUP> =
</SUP>dentate gyrus=20
of the hippocampus<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R1-12661=
5"><SUP>1</SUP></A>=20
and the subventricular zone<SUP> </SUP>(SVZ) of the lateral =
ventricles.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R1-12661=
5"><SUP>1=963</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R2-12661=
5"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R3-12661=
5"></A>From=20
the SVZ, newly<SUP> </SUP>generated neurons reach their final =
destination in the=20
olfactory<SUP> </SUP>bulb after long-distance migration through a =
well-defined=20
path<SUP> </SUP>called the rostral migratory stream (RMS)<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R2-12661=
5"><SUP>2,3</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R3-12661=
5"></A>(<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#FIG1">Fi=
gure=20
1</A>). The<SUP> </SUP>SVZ is the adult brain region with the highest=20
neurogenetic<SUP> </SUP>rate, from which NSCs have been firstly =
isolated<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R4-12661=
5"><SUP>4</SUP></A>=20
and characterized<SUP> </SUP>for their ability to give rise to =
non-neural=20
cells.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R5-12661=
5"><SUP>5=967</SUP></A><SUP>=20
</SUP><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R6-12661=
5"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R7-12661=
5"></A>Thus,=20
in this review we shall focus our attention on SVZ-derived<SUP> =
</SUP>NSCs.<SUP>=20
</SUP>
<P><A name=3DFIG1><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598/FIG1"><I=
MG=20
            height=3D146 alt=3D" " hspace=3D10=20
            =
src=3D"http://circres.ahajournals.org/content/vol92/issue6/images/small/9=
FF1.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (62K):<BR><NOBR><A=20
            =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598/FIG1">[i=
n=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG1', 590, 522); =
this.href=3D'/cgi/content-nw/full/92/6/598/FIG1'"=20
            =
href=3D"http://circres.ahajournals.org/cgi/content-nw/full/92/6/598/FIG1"=
=20
            target=3DFIG1>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 1. </B>A, Global view =
of the=20
            adult rodent brain that depicts (in gray) the regions within =
which=20
            continuous neurogenesis occurs throughout adulthood, namely =
the=20
            olfactory bulb (OB) and the hippocampus (H). Areas that are =
known to=20
            contain NSCs are outlined in black: the subventricular zone =
(SVZ)=20
            with its rostral extension reaching the OB and the dentate =
gyrus=20
            (DG) of the hippocampus. B, Schematic sagittal section of =
the adult=20
            rodent brain through the SVZ-RE system; the dotted line =
outlines the=20
            contour of the lateral ventricle (LV). The SVZ is composed =
of a=20
            posterior part (dark gray) lining the lateral ventricle =
(SVZ-LV) and=20
            an anterior part (light gray) forming the rostral extension=20
            (SVZ-RE). CC indicates corpus callosum; CX, cerebral cortex; =
and OB,=20
            olfactory bulb. C, Transverse sections of the SVZ at the =
levels 1=20
            and 2 as indicated in A and B; 1, SVZ-RE, 2, SVZ of the =
lateral=20
            ventricle (LV; see also <A=20
            =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#FIG2">Fi=
gure=20
            2</A>A). Glial tubes are in black; CH, chains of neuronal=20
            precursors; CC, corpus callosum; e, ependymal monolayer. D,=20
            Schematic representation of the chains of migrating =
neuroblasts=20
            within the astroglial tubes (in black). Tubes are not =
present in the=20
            distal tip of the OB (gray shadowed area), within which the=20
            neuroblasts depart from the terminal end of the tubes, leave =
the=20
            chains by detaching from each other, and migrate outwardly=20
            (radially) as isolated cells (n) through the OB parenchyma. =
T=20
            indicates tangential chain migration; R, radial migration; =
N,=20
            differentiated neurons in the olfactory bulb; SC, area in =
which the=20
            stem cells are found; and MP, area containing migrating =
precursors=20
            but not NSCs (modified from Peretto P, Merighi A, Fasolo A, =
Bonfanti=20
            L. The subependymal layer in rodents: a site of structural=20
            plasticity and cell migration in the adult mammalian brain. =
<I>Brain=20
            Res Bull</I>. 1999;49:221=96243).
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>
<P><A name=3DFIG2><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598/FIG2"><I=
MG=20
            height=3D157 alt=3D" " hspace=3D10=20
            =
src=3D"http://circres.ahajournals.org/content/vol92/issue6/images/small/9=
FF2.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (78K):<BR><NOBR><A=20
            =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598/FIG2">[i=
n=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG2', 590, 546); =
this.href=3D'/cgi/content-nw/full/92/6/598/FIG2'"=20
            =
href=3D"http://circres.ahajournals.org/cgi/content-nw/full/92/6/598/FIG2"=
=20
            target=3DFIG2>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 2. </B>Neural stem =
cells of the=20
            adult rodent brain. A, Transverse section through the=20
            periventricular SVZ is shown. This section corresponds to =
the plane=20
            section 2 as shown in <A=20
            =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#FIG1">Fi=
gure=20
            1</A>. V indicates ventricle; SVZ, subventricular zone. =
Arrows point=20
            to some of the proliferating cells in the SVZ that were =
labeled=20
            after intraperitoneal injection of the thymidine analogue,=20
            5-bromodeoxyuridine. SVZ contains fast and slow =
proliferating=20
            precursor populations with a cell cycle time comprised =
between 12=20
            hours and 28 days. B through D, Stem cells isolated from the =
SVZ are=20
            shown in serum-free cultures in the presence of both EGF and =
FGF2.=20
            Under these conditions, stem cells undergo proliferation, =
eventually=20
            giving rise to neurospheres. One day (B), 4 days (C), 7 days =
(D)=20
            after plating. E, On removal of growth factors and plating =
onto a=20
            laminin-coated substrate, cells in the sphere differentiate =
into=20
            mature brain cells that express the typical markers of =
neurons (red,=20
            =DF-tubulin), astrocytes (green, glial fibrillary acidic =
protein), and=20
            oligodendrocytes (blue, O4). Bars: A=3D100 =B5m; B and =
C=3D20 =B5m (bar in=20
            B); E=3D30 =B5m.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>
<P>Lately, the "antidogmatic" nature of NSCs has emerged twice.<SUP>=20
</SUP>Although the scenario is gradually changing,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R8-12661=
5"><SUP>8=9610</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R9-12661=
5"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R10-1266=
15"></A>the<SUP>=20
</SUP>lack of specific markers has long hampered the univocal=20
identification<SUP> </SUP>and characterization of NSCs. However, the use =
of=20
specific systems<SUP> </SUP>has permitted the isolation and impressive =
expansion=20
of NSCs<SUP> </SUP>ex vivo=97quite a striking phenomenon for cells of =
the=20
most<SUP> </SUP>quiescent bodily tissue. This has allowed the =
establishment<SUP>=20
</SUP>of NSC lines from various species, including humans, that are<SUP> =

</SUP>being used to explore novel therapeutic strategies to treat<SUP>=20
</SUP>neurological disorders (see reviews<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R1-12661=
5"><SUP>1,11,12</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R11-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R12-1266=
15"></A>)=20
as well as trigged<SUP> </SUP>an impressive plethora of studies =
investigating=20
the differentiation<SUP> </SUP>potential of NSCs, which may be broader =
than=20
expected. In fact,<SUP> </SUP>an impressive example of the extreme =
developmental=20
potential<SUP> </SUP>of NSCs may have been provided by studies in which =
NSCs=20
appear<SUP> </SUP>to generate cell types that belong to developmentally=20
unrelated<SUP> </SUP>tissues=97a concept that may also apply to stem =
cells=20
from<SUP> </SUP>the hemopoietic system and from other adult =
tissues.<SUP> </SUP>
<P><A name=3DSEC1><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D* hspace=3D5 =
src=3D"http://circres.ahajournals.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp; The=20
      Forebrain Subventricular Zone as a Source of Adult NSCs: A "Brain =
Marrow"=20
      Case? </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#top"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#ABS"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#BDY"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Introduction<BR></A><IMG height=3D9 alt=3D* hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>The Forebrain =
Subventricular...</FONT><BR><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC2"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>The Nature and Origin...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC3"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Ex Vivo Behavior of...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC4"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Plasticity of NSCs Within...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC5"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Plasticity of NSCs Outside...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC6"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Conclusions<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#BIBL"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>I=
n the=20
mammalian adult brain, the genesis of new neurons continues<SUP>=20
</SUP>throughout life within two 3-layered cortical regions, the=20
hippocampus<SUP> </SUP>and olfactory bulb (OB), where it is sustained by =

endogenous<SUP> </SUP>stem cells. The most active NSC compartment is =
found in=20
SVZ.<SUP> </SUP>This area represents a remnant of the embryonic germinal =

neuroepithelium,<SUP> </SUP>which persists throughout life as an =
actively=20
mitotic layer<SUP> </SUP>in the wall of the telencephalic lateral =
ventricles and=20
along<SUP> </SUP>its rostral extension toward the olfactory bulb (<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#FIG1">Fi=
gure=20
1</A>).<SUP> </SUP>A complete turnover of the resident proliferating =
cell=20
population<SUP> </SUP>occurs every 12 to 28 days in the SVZ,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R13-1266=
15"><SUP>13</SUP></A>=20
with about 30 000 new<SUP> </SUP>neuronal precursors (neuroblasts) being =

produced every day and<SUP> </SUP>migrating to the OB<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R3-12661=
5"><SUP>3</SUP></A>=20
(<A =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#FIG1">Fi=
gure=20
1</A>).<SUP> </SUP>
<P>Two main cell types are found in the SVZ: migratory, =
proliferating<SUP>=20
</SUP>neuroblasts and astrocytes (<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#FIG1">Fi=
gure=20
1</A>). The latter form a meshwork<SUP> </SUP>throughout the whole SVZ =
and are=20
organized into channels that<SUP> </SUP>are oriented along the =
anteroposterior=20
axis and are called glial<SUP> </SUP>tubes.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R14-1266=
15"><SUP>14=9616</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R15-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R16-1266=
15"></A>Within=20
these glial tubes, NSC-generated<SUP> </SUP>neuroblasts undergo =
rostraward,=20
tangential migration as cells<SUP> </SUP>grouped into tightly packed =
chains.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R14-1266=
15"><SUP>14,17</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R17-1266=
15"></A>Eventually,=20
neuroblasts<SUP> </SUP>reach the distal tip of the OB, separate from =
each other=20
and<SUP> </SUP>leave the tubes, shifting their migration pattern from=20
tangential<SUP> </SUP>to radial. In this way, they reach the more =
superficial OB=20
layers<SUP> </SUP>and terminally differentiate into granule and=20
periglomerular<SUP> </SUP>neurons. Importantly, tangential migration =
toward the=20
OB has<SUP> </SUP>also been documented in the adult brain of primates<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R18-1266=
15"><SUP>18,19</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R19-1266=
15"></A>and<SUP>=20
</SUP>even in the infant human brain.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R20-1266=
15"><SUP>20</SUP></A>=20
Also, the possible migration<SUP> </SUP>of cells from the SVZ to the =
neocortex=20
has been proposed in<SUP> </SUP>mouse<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R21-1266=
15"><SUP>21,22</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R22-1266=
15"></A>as=20
well as in adult macaque monkeys,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R23-1266=
15"><SUP>23=9625</SUP></A><SUP>=20
</SUP><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R24-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R25-1266=
15"></A>although=20
this view has recently been questioned.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R18-1266=
15"><SUP>18</SUP></A><SUP>=20
</SUP>
<P>Glial tubes are composed of a special type of astroglia that<SUP>=20
</SUP>expresses the marker of mature CNS astrocytes, namely glial<SUP>=20
</SUP>fibrillary acidic protein (GFAP), but also contain the =
cytoskeletal<SUP>=20
</SUP>proteins vimentin and nestin.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R16-1266=
15"><SUP>16,17</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R17-1266=
15"></A>The=20
presence in glial tubes<SUP> </SUP>of such molecules, known to abound in =
those=20
immature and radial<SUP> </SUP>glial cells that guide young neurons =
during CNS=20
development,<SUP> </SUP>suggested a role for glial tubes in influencing =
the=20
migration/guidance<SUP> </SUP>of neuroblasts in the SVZ. However, the =
actual=20
role of astroglial<SUP> </SUP>cells in this process remains unclear.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R26-1266=
15"><SUP>26</SUP></A>=20
They may simply act<SUP> </SUP>as a barrier to prevent neuroblasts from =
escaping=20
the proper<SUP> </SUP>migratory route before they reach the OBs.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R17-1266=
15"><SUP>17</SUP></A>=20
Although the presence<SUP> </SUP>of astrocytes is not essential for =
chain=20
migration,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R27-1266=
15"><SUP>27</SUP></A>=20
they do<SUP> </SUP>secrete factors that facilitate this process.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R28-1266=
15"><SUP>28</SUP></A>=20
Notably, astroglial<SUP> </SUP>tubes and NSCs do not coexist solely =
within the=20
periventricular<SUP> </SUP>aspect of the SVZ but also within the rostral =

migratory stream<SUP> </SUP>that extends into the OB,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R29-1266=
15"><SUP>29</SUP></A>=20
with the former perhaps contributing<SUP> </SUP>to create an appropriate =
stem=20
cell "niche" for the maintenance<SUP> </SUP>of NSCs all along the =
pathway.<SUP>=20
</SUP>
<P>In an appealing functional/structural parallelism with the =
hemopoietic<SUP>=20
</SUP>system, it has been proposed to use terms like "neuropoiesis"<SUP> =

</SUP>to portray the persistence of neurogenesis in adulthood, and<SUP>=20
</SUP>"brain marrow" to describe the anatomical regions that =
contain<SUP>=20
</SUP>the NSCs supporting neurogenesis.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R30-1266=
15"><SUP>30,31</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R31-1266=
15"></A>Thus,=20
whereas hematopoiesis<SUP> </SUP>takes place within the boundaries of =
the marrow=20
in the deep<SUP> </SUP>adult bone, adult neurogenesis is a spatially =
confined=20
process,<SUP> </SUP>constrained within the boundaries of the brain-deep =
SVZ.=20
In<SUP> </SUP>both "marrows", we can find (1) proliferating =
stem/progenitor<SUP>=20
</SUP>cells, (2) cell types, which can carry out stromal =
function(s),<SUP>=20
</SUP>and (3) extracellular matrix that can modulate cell =
proliferation,<SUP>=20
</SUP>adhesion, and migration. Stromal cells of the bone marrow are<SUP> =

</SUP>known to act as an interface between peripheral blood and the<SUP> =

</SUP>stem/progenitor pool, thus modulating the fate of =
hematopoietic<SUP>=20
</SUP>stem cells (HSCs). In a similar fashion, astrocytes and =
ependymal<SUP>=20
</SUP>cells of the SVZ may act as "stromal" elements of the CNS by<SUP>=20
</SUP>producing molecules as bone morphogenetic proteins that =
affect<SUP>=20
</SUP>the neuronal versus glial fate of the stem/progenitor cells.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R32-1266=
15"><SUP>32</SUP></A><SUP>=20
</SUP>Furthermore, the extracellular matrix of both the SVZ and =
bone<SUP>=20
</SUP>marrow contains tenascin and proteoglycans, molecules that =
are<SUP>=20
</SUP>important in the formation of developmental compartments and<SUP> =
</SUP>in=20
the control of cell adhesion, migration and differentiation.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R15-1266=
15"><SUP>15,30,31,33</SUP></A><SUP>=20
</SUP><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R30-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R31-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R33-1266=
15"></A>Finally,=20
similarly to the bone marrow, the proximity of the<SUP> </SUP>SVZ with =
the=20
cerebrospinal fluid, the enlarged intercellular<SUP> </SUP>spaces, the =
reduced=20
cell-cell contacts,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R15-1266=
15"><SUP>15,16,19</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R16-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R19-1266=
15"></A>and=20
the presence<SUP> </SUP>of molecules linked to water cotransport<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R34-1266=
15"><SUP>34,35</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R35-1266=
15"></A>contribute=20
to<SUP> </SUP>create in the SVZ a cytoarchitectural/biochemical niche,=20
which<SUP> </SUP>is very different from the environment of the mature =
CNS=20
parenchyma.<SUP> </SUP>
<P><A name=3DSEC2><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D* hspace=3D5 =
src=3D"http://circres.ahajournals.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp; The=20
      Nature and Origin of the Adult Neural Stem Cell In Vivo=20
  </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#top"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#ABS"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#BDY"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC1"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>The Forebrain Subventricular...<BR></A><IMG height=3D9 =
alt=3D*=20
      hspace=3D5 =
src=3D"http://circres.ahajournals.org/icons/toc/dot.gif" width=3D11=20
      border=3D0><FONT color=3D#464c53>The Nature and =
Origin...</FONT><BR><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC3"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Ex Vivo Behavior of...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC4"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Plasticity of NSCs Within...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC5"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Plasticity of NSCs Outside...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC6"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Conclusions<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#BIBL"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>A=
 series=20
of observations indicate that a specific subtype of<SUP> </SUP>SVZ =
astroglial=20
cells is the actual NSC<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R36-1266=
15"><SUP>36</SUP></A>=20
(see review<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R26-1266=
15"><SUP>26</SUP></A>).=20
In<SUP> </SUP>fact, after the killing of all the proliferating SVZ=20
neuroblasts<SUP> </SUP>by administration of subdural, cytotoxic doses of =

antimitotic<SUP> </SUP>drugs, only astroglial cells were left, which=20
surprisingly,<SUP> </SUP>were shown to be able to regenerate the entire =
SVZ cell=20
system.<SUP> </SUP>According to this view, some of the SVZ astrocytes =
(named=20
type<SUP> </SUP>B cells) are thought to represent relatively quiescent =
stem<SUP>=20
</SUP>cells that normally proliferate at a low rate and generate =
the<SUP>=20
</SUP>neuronal precursors (type A cells), through the generation of<SUP> =
</SUP>a=20
third, intermediate cell type: the C cell (or D cell in the<SUP>=20
</SUP>hippocampus<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R37-1266=
15"><SUP>37</SUP></A>),=20
which has the characteristics of the classic,<SUP> =
</SUP>fast-proliferating,=20
transit-amplifying progenitor cells found<SUP> </SUP>in many =
self-renewing=20
tissues.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R36-1266=
15"><SUP>36,38,39</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R38-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R39-1266=
15"></A>Taking=20
into account<SUP> </SUP>the immature features of SVZ astrocytes<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R16-1266=
15"><SUP>16,17,36</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R17-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R36-1266=
15"></A>and=20
the fact<SUP> </SUP>that radial glia of the developing cerebral cortex =
can act=20
as<SUP> </SUP>a bipotent stem cell,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R40-1266=
15"><SUP>40</SUP></A>=20
it is most likely that NSCs originate<SUP> </SUP>from type B cells that =
retain=20
radial glia-like features within<SUP> </SUP>specific regions of the =
adult brain=20
(see review<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R38-1266=
15"><SUP>38</SUP></A>).<SUP>=20
</SUP>
<P>It should be emphasized, however, that NSCs can also be isolated<SUP> =

</SUP>and grown in vitro from nonneurogenic periventricular =
regions,<SUP>=20
</SUP>in which the mature parenchyma is directly in contact with =
the<SUP>=20
</SUP>ependymal monolayer, such as the fourth ventricle or the =
spinal<SUP>=20
</SUP>cord.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R41-1266=
15"><SUP>41</SUP></A>=20
These findings may indicate that cells endowed with<SUP> </SUP>some =
extent of=20
stem-like potential may exist throughout the<SUP> </SUP>whole adult CNS =
tissue.=20
However, only those NSCs that occur<SUP> </SUP>within adult brain areas =
that=20
retain a brain marrow-like environment,<SUP> </SUP>as the SVZ, take up =
an actual=20
stem-cell behavior, self-renew,<SUP> </SUP>and generate a mature progeny =
in=20
vivo, whereas those residing<SUP> </SUP>within nonneurogenetic regions =
may=20
remain dormant.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R42-1266=
15"><SUP>42=9644</SUP></A><SUP>=20
</SUP><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R43-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R44-1266=
15"></A><SUP></SUP>
<P><A name=3DSEC3><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D* hspace=3D5 =
src=3D"http://circres.ahajournals.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp; Ex=20
      Vivo Behavior of NSCs </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#top"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#ABS"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#BDY"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC1"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>The Forebrain Subventricular...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC2"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>The Nature and Origin...<BR></A><IMG height=3D9 alt=3D* =
hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Ex Vivo Behavior =
of...</FONT><BR><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC4"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Plasticity of NSCs Within...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC5"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Plasticity of NSCs Outside...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC6"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Conclusions<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#BIBL"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>T=
o carry=20
out the vital function of maintaining cell homeostasis<SUP> </SUP>and =
integrity=20
throughout life, stem cells are endowed with peculiar<SUP> =
</SUP>functional=20
characteristics that provide suitable criteria to<SUP> </SUP>identify =
and=20
classify them. In fact, stem cells are highly undifferentiated<SUP> =
</SUP>cells=20
possessing a significant proliferation potential, a broad<SUP>=20
</SUP>developmental fate, and most and foremost, an intrinsic =
capacity<SUP>=20
</SUP>for self-perpetuation=97better defined as self-maintenance<SUP> =
</SUP>or=20
self-renewal=97throughout adulthood.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R39-1266=
15"><SUP>39</SUP></A><SUP>=20
</SUP>
<P>Historically, hemopoietic stem cells (HSCs) have been the first<SUP> =
</SUP>to=20
provide a useful prototypic functional model in order to<SUP> =
</SUP>devise=20
conceptual and practical strategies to tackle investigations<SUP> =
</SUP>on other=20
stem cell types.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R45-1266=
15"><SUP>45</SUP></A>=20
When comparing HSCs and NSCs with<SUP> </SUP>regard to their functions, =
the two=20
systems appear to sit at<SUP> </SUP>opposite sides of the functional =
spectrum.=20
Because enormous<SUP> </SUP>amounts of new blood cells are generated =
every day=20
from stem<SUP> </SUP>cells of the hemopoietic tissue(s), it has been =
possible=20
to<SUP> </SUP>develop an in vivo functional assay by which bona fide =
stem<SUP>=20
</SUP>cells (even a single candidate cell<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R46-1266=
15"><SUP>46</SUP></A>)=20
have been identified<SUP> </SUP>for their capacity to reconstitute the=20
hemopoietic stem compartment<SUP> </SUP>after its deadly experimental =
ablation.=20
Moreover, a reliable<SUP> </SUP>antigenic fingerprint based on the =
expression of=20
multiple, lineage-specific<SUP> </SUP>markers is now available to =
distinguish=20
various hemopoietic<SUP> </SUP>precursors. However, one of the most =
significant=20
hurdles in<SUP> </SUP>the field of HSCs is their resilience to undergo =
extensive=20
proliferation<SUP> </SUP>in culture.<SUP> </SUP>
<P>Fascinatingly, a mirror-like situation has emerged in the field<SUP> =
</SUP>of=20
NSCs. Given the relative overall quiescence and=20
structural/cytoarchitectural<SUP> </SUP>"rigidity" of the brain =
parenchyma, the=20
classical hemopoietic<SUP> </SUP>experimental paradigms of =
reconstitution of=20
ablated stem cell<SUP> </SUP>compartments are rarely used to investigate =
and=20
characterize<SUP> </SUP>NSCs. Thus, the study of NSCs received much of =
its=20
initial impulse<SUP> </SUP>from in vitro findings that firstly =
demonstrated and=20
exploited<SUP> </SUP>the amazing proliferation capacity that NSCs =
display in=20
culture.<SUP> </SUP>
<P>Under appropriate conditions and in the presence of mitogens<SUP>=20
</SUP>(epidermal growth factor (EGF) and/or fibroblast growth =
factor<SUP>=20
</SUP>2 [FGF2]), it is possible to induce the proliferation of =
rapidly<SUP>=20
</SUP>dividing precursors from the SVZ. At least in vitro, these =
precursors<SUP>=20
</SUP>fulfill most of the criteria of bona fide stem cells.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R47-1266=
15"><SUP>47=9649</SUP></A><SUP>=20
</SUP><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R48-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R49-1266=
15"></A>Lately,=20
these cultured NSCs have been suggested to derive<SUP> </SUP>from the C =
type=20
cells of the SVZ.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R50-1266=
15"><SUP>50</SUP></A>=20
Since in vivo type C cells<SUP> </SUP>represent transit-amplifying =
progenitors=20
rather than bona fide<SUP> </SUP>stem cells, the concept has been put =
forth for=20
the possibility<SUP> </SUP>that tissue culturing and/or mitogens can =
re-awake a=20
latent<SUP> </SUP>stem cell program in what can be considered "potential =

stem<SUP> </SUP>cells."<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R39-1266=
15"><SUP>39</SUP></A>=20
On removal of the mitogens, the progeny of NSCs promptly<SUP>=20
</SUP>differentiate into the three main cell types of the CNS =
(astrocytes,<SUP>=20
</SUP>oligodendrocytes, and neurons) (<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#FIG2">Fi=
gure=20
2</A>).<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R36-1266=
15"><SUP>36,42,51=9654</SUP></A><SUP>=20
</SUP><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R42-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R51-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R52-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R53-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R54-1266=
15"></A>It=20
should be noted that similar results could be obtained<SUP> </SUP>with =
adult=20
hippocampal cells.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R55-1266=
15"><SUP>55</SUP></A><SUP>=20
</SUP>
<P>The most important concept regarding this method is that it<SUP>=20
</SUP>represents a selective system by which, in a heterogeneous =
primary<SUP>=20
</SUP>culture, the more committed progenitors and/or differentiated<SUP> =

</SUP>mature cells rapidly die and thus are eliminated, whereas the<SUP> =

</SUP>undifferentiated NSCs are positively selected and forced to<SUP>=20
</SUP>access a state of active proliferation.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R12-1266=
15"><SUP>12</SUP></A>=20
NSCs start proliferating<SUP> </SUP>initially as adherent cells and =
attach to=20
each other, eventually<SUP> </SUP>giving rise to spherical clusters that =
float=20
in suspension and<SUP> </SUP>form the so-called "neurospheres." In =
giving rise=20
to neurospheres,<SUP> </SUP>NSCs undergo multiple symmetric cell =
divisions by=20
which two<SUP> </SUP>new NSCs are generated at each cycle (<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#FIG3">Fi=
gure=20
3</A>). It should be<SUP> </SUP>noted that not all the NSC progeny found =
in a=20
neurosphere are<SUP> </SUP>stem cells. Indeed, only 10% to 50% of these =
progeny=20
retain<SUP> </SUP>stem cell features, whereas the remainders are cells =
that=20
undergo<SUP> </SUP>spontaneous differentiation. Consequently, a =
neurosphere=20
is<SUP> </SUP>a mixture of NSCs, differentiating progenitors, and even=20
differentiated<SUP> </SUP>neurons and glia, depending on the neurosphere =
size=20
and time<SUP> </SUP>in culture. This is the reason why neurospheres are=20
subcultured<SUP> </SUP>by harvesting, followed by mechanical =
dissociation and by=20
re-plating<SUP> </SUP>under the same growth conditions. As in the =
primary=20
culture,<SUP> </SUP>differentiating/differentiated cells rapidly die =
while the=20
NSCs<SUP> </SUP>continue to proliferate, giving rise to many secondary=20
spheres<SUP> </SUP>and exponential growth in vitro. In this way, stable =
NSCs=20
cell<SUP> </SUP>lines can be obtained.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R12-1266=
15"><SUP>12</SUP></A><SUP>=20
</SUP>
<P><A name=3DFIG3><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598/FIG3"><I=
MG=20
            height=3D154 alt=3D" " hspace=3D10=20
            =
src=3D"http://circres.ahajournals.org/content/vol92/issue6/images/small/9=
FF3.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (35K):<BR><NOBR><A=20
            =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598/FIG3">[i=
n=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG3', 590, 538); =
this.href=3D'/cgi/content-nw/full/92/6/598/FIG3'"=20
            =
href=3D"http://circres.ahajournals.org/cgi/content-nw/full/92/6/598/FIG3"=
=20
            target=3DFIG3>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 3. </B>Schematic =
outline of how=20
            stem cell expansion is achieved in cultured neural stem =
cells. A,=20
            Under serum-free conditions and in the sustained presence of =

            mitogens such as EGF and/or FGF2, NSCs (red, S) are thought =
to=20
            undergo symmetric divisions in which either (i) two more=20
            differentiated cells (likely transient amplifying =
precursors, green,=20
            T) (symmetric differentiative divisions) or (ii) two NSCs =
are=20
            generated (symmetric proliferative divisions); (iii) =
asymmetric=20
            cycles giving rise to one NSC and to one more differentiated =
(not=20
            shown) or apoptotic cell (yellow) can also take place at the =
same=20
            time. If within a NSC population the frequency of =
proliferative=20
            cycles equals that of differentiative divisions, the overall =
number=20
            of NSCs within the pool is maintained at a steady level<A=20
            =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R39-1266=
15"><SUP>39</SUP></A>;=20
            (iv) under the conditions used for NSCs expansion, the =
number of=20
            proliferative divisions normally exceeds that of =
differentiative=20
            cycles, so that an increasing number of NSCs is generated =
within the=20
            stem cell pool at each cell generation. B, Starting from a =
single=20
            NSC (red) all the types of cell division described in A =
concur to=20
            the formation a clonal cluster of cells called neurosphere.=20
            Therefore, each neurosphere contains a mixture of many NSCs, =
as well=20
            as transient amplifying precursors (green) and dead/dying =
cells=20
            (yellow). When neurospheres are dissociated, all but the =
stem cells=20
            die (light blue shadowed area), due to the stringent culture =

            conditions, whereas NSCs continue to proliferate, giving =
rise to=20
            more, secondary neurospheres. This procedure can be repeated =

            sequentially over many months, resulting in an exponential =
increase=20
            in the overall number of NSCs and in the establishment of =
NSC stable=20
            cell lines.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>
<P>Due to these properties, it has been possible to establish =
continuous<SUP>=20
</SUP>mouse transgenic/genetically modified<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R56-1266=
15"><SUP>56</SUP></A>=20
or human NSC lines<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R57-1266=
15"><SUP>57,58</SUP></A><SUP>=20
</SUP><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R58-1266=
15"></A>that=20
expand merely by growth factor stimulation and under completely<SUP>=20
</SUP>chemically defined conditions. In particular, human NSC lines<SUP> =

</SUP>represent a renewable source of normal nervous cells that =
might<SUP>=20
</SUP>facilitate basic studies on human neurogenesis and drug =
discovery<SUP>=20
</SUP>and, remarkably, may virtually eliminate the need of fetal =
human<SUP>=20
</SUP>tissue for therapeutic neural transplantation. It is well =
known<SUP>=20
</SUP>that some CNS disorders may require grafting of specific =
neuronal<SUP>=20
</SUP>subtypes. Notably, human NSCs, which are available in huge =
amount<SUP>=20
</SUP>as compared with fetal tissues, can be easily induced to=20
differentiate<SUP> </SUP>into specific cell types and/or =
neurotransmitter=20
phenotypes<SUP> </SUP>by simply modifying the culture medium. For =
example,=20
NSC-derived<SUP> </SUP>GABAergic neurons could be used to replace =
GABAergic=20
spiny neurons<SUP> </SUP>lost in Huntington=92s disease. Similarly, we =
have=20
been<SUP> </SUP>able to induce a significant fraction of the progeny of=20
various<SUP> </SUP>human NSC lines to express catecholaminergic neuronal =

features<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R59-1266=
15"><SUP>59</SUP></A><SUP>=20
</SUP>that may prove useful for cell replacement therapy in =
Parkinson=92s<SUP>=20
</SUP>disease. Very recently, human NSCs have been shown to =
efficiently<SUP>=20
</SUP>integrate in the adult rat brain where they differentiated =
acquiring<SUP>=20
</SUP>a cholinergic phenotype.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R60-1266=
15"><SUP>60</SUP></A>=20
Thus, in addition to markedly reducing<SUP> </SUP>the use of human fetal =
brain=20
tissue, stem cell lines may eventually<SUP> </SUP>eliminate the need for =
tissue=20
exclusively from selected embryonic<SUP> </SUP>regions.<SUP> </SUP>
<P>The issues discussed so far prompt some final remarks as to<SUP> =
</SUP>the=20
classification of NSCs with respect to their ex vivo behavior.<SUP>=20
</SUP>Recently, the identification of putative NSC markers as =
AC133,<SUP>=20
</SUP>PNA<SUP>low</SUP>/HSA<SUP>low</SUP>, and LeX/ssea-1<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R8-12661=
5"><SUP>8=9610</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R9-12661=
5"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R10-1266=
15"></A>has=20
provided researchers<SUP> </SUP>with a valuable tool for identifying and =

enriching bona fide<SUP> </SUP>NSCs. This antigenic characterization =
will=20
eventually help to<SUP> </SUP>resolve the state of confusion in the NSC =
area in=20
which classification<SUP> </SUP>based on functional approaches presents =
severe=20
limitations due<SUP> </SUP>to the different techniques, the variety of =
the brain=20
regions<SUP> </SUP>investigated, and the variable ages of the donors =
yielding=20
the<SUP> </SUP>isolation of different precursor cell types that all=20
promiscuously<SUP> </SUP>go by the name of NSCs.<SUP> </SUP>
<P>Once again, it is tempting to borrow from the hemopoietic field,<SUP> =

</SUP>in which a lineage of stem cells endowed with progressively<SUP>=20
</SUP>narrowing self-renewal capacities has clearly been defined.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R61-1266=
15"><SUP>61</SUP></A><SUP>=20
</SUP>Although limited to the in vitro studies and mainly for =
practical<SUP>=20
</SUP>purposes, we speculate that a similar criterion of =
classification<SUP>=20
</SUP>may be initially assumed for NSCs, thus identifying them as<SUP>=20
</SUP>long-term or short-term self-renewing NSCs based on the =
extent<SUP>=20
</SUP>of their self-maintenance ability in culture. At this point,<SUP> =
</SUP>we=20
ought to remember that (1) challenging a cell in vitro only<SUP> =
</SUP>unveils=20
its developmental potential and not its actual in vivo<SUP> </SUP>fate, =
and (2)=20
the extent by which a cell can self-renew in vitro<SUP> </SUP>may depend =
on the=20
culture conditions adopted. Nevertheless,<SUP> </SUP>it has also emerged =
that=20
some NSCs from distinct regions display<SUP> </SUP>clearly distinct =
self-renewal=20
capacities under identical culture<SUP> </SUP>conditions, thus lending =
to the=20
attempt to classify cultured<SUP> </SUP>NSCs based on the self-renewal =
capacity=20
that they display in<SUP> </SUP>vitro.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R62-1266=
15"><SUP>62,63</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R63-1266=
15"></A><SUP></SUP>
<P><A name=3DSEC4><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D* hspace=3D5 =
src=3D"http://circres.ahajournals.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Plasticity of NSCs Within the CNS =
</FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#top"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#ABS"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#BDY"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC1"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>The Forebrain Subventricular...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC2"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>The Nature and Origin...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC3"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Ex Vivo Behavior of...<BR></A><IMG height=3D9 alt=3D* =
hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Plasticity of NSCs =
Within...</FONT><BR><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC5"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Plasticity of NSCs Outside...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC6"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Conclusions<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#BIBL"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>A=
lthough=20
in vivo NSCs appear to generate almost exclusively<SUP> </SUP>neuronal =
cells,=20
their actual developmental potential as observed<SUP> </SUP>ex vivo is =
much=20
broader than expected. In fact, cultured NSCs<SUP> </SUP>do give rise to =

neurons, astrocytes, and oligodendrocytes and<SUP> </SUP>are therefore =
normally=20
classified as being multipotent in nature.<SUP> </SUP>The concept of NSC =

plasticity and of their dependence on environmental<SUP> </SUP>cues is=20
strengthened by transplantation and manipulation/recruitment<SUP> =
</SUP>studies=20
in vivo. For example, intrahippocampus transplantation<SUP> </SUP>of =
hippocampal=20
stem cells results in the generation of the neuronal<SUP> </SUP>types =
normally=20
found within this region.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R55-1266=
15"><SUP>55</SUP></A>=20
However, if the same<SUP> </SUP>hippocampal stem cells are transplanted=20
heterotopically, that<SUP> </SUP>is into the SVZ, they produce cell =
types that=20
are normally found<SUP> </SUP>in the latter, rather than hippocampal =
ones.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R55-1266=
15"><SUP>55</SUP></A>=20
Further, when<SUP> </SUP>transplanted in adult brain regions in which no =

neurogenesis<SUP> </SUP>takes place, NSCs produce exclusively glial =
cells. After=20
intracerebral<SUP> </SUP>administration of growth factors, namely EGF,<A =

href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R64-1266=
15"><SUP>64</SUP></A>=20
FGF2,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R65-1266=
15"><SUP>65</SUP></A>=20
or transforming<SUP> </SUP>growth factor-<IMG alt=3D{alpha}=20
src=3D"http://circres.ahajournals.org/math/agr.gif" border=3D0> =
(TGF-<IMG=20
alt=3D{alpha} src=3D"http://circres.ahajournals.org/math/agr.gif" =
border=3D0>),<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R66-1266=
15"><SUP>66</SUP></A>=20
the proliferation of cells in the SVZ<SUP> </SUP>is dramatically =
increased and=20
the fate of the progeny can change<SUP> </SUP>depending on the type of =
factor(s)=20
used. In particular, EGF<SUP> </SUP>infusion results in an increased =
production=20
of cells in the<SUP> </SUP>SVZ, in a diversion of their migration =
pattern from=20
tangential<SUP> </SUP>to radial,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R65-1266=
15"><SUP>65</SUP></A>=20
and in the eventual generation of cells of the<SUP> </SUP>glial lineage =
rather=20
than neurons.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R64-1266=
15"><SUP>64,65</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R65-1266=
15"></A>These=20
findings altogether<SUP> </SUP>re-emphasize the concept expressed =
earlier in=20
this review that<SUP> </SUP>NSCs appear to possess a rather broad =
developmental=20
potential<SUP> </SUP>and functional repertoire whose expression is =
strongly=20
influenced<SUP> </SUP>by extracellular cues.<SUP> </SUP>
<P><A name=3DSEC5><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D* hspace=3D5 =
src=3D"http://circres.ahajournals.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Plasticity of NSCs Outside the CNS =
</FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#top"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#ABS"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#BDY"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC1"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>The Forebrain Subventricular...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC2"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>The Nature and Origin...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC3"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Ex Vivo Behavior of...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC4"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Plasticity of NSCs Within...<BR></A><IMG height=3D9 =
alt=3D* hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Plasticity of NSCs =
Outside...</FONT><BR><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC6"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Conclusions<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#BIBL"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>S=
ome=20
important considerations have emerged so far. First, the<SUP> =
</SUP>nervous=20
tissue contains bona fide stem cells that support neuronal<SUP> =
</SUP>cell=20
turnover throughout life. Second, despite their origin<SUP> </SUP>from =
one of=20
the most quiescent tissues in the body, NSCs can<SUP> </SUP>undergo =
effective=20
long-term culturing, proliferation and expansion<SUP> </SUP>while =
retaining=20
stable functional characteristics. Third, when<SUP> </SUP>properly =
challenged,=20
the overall developmental potential appears<SUP> </SUP>to be broader =
than that=20
observed under physiological conditions<SUP> </SUP>in vivo.<SUP> </SUP>
<P>This section reviews recent observations suggesting that this<SUP>=20
</SUP>plasticity may perhaps outstretch the brain boundaries, so =
that<SUP>=20
</SUP>NSCs (neuroectodermal in origin) can give rise to cells that<SUP>=20
</SUP>normally derive from germ layers other than the =
neuroectoderm.<SUP>=20
</SUP>This is discussed later, in the more general perspective that<SUP> =

</SUP>many somatic stem cells may give rise to cells of an =
embryonic<SUP>=20
</SUP>origin different from their own. One of the most intriguing<SUP>=20
</SUP>cases is the virtual pluripotency of bone marrow=96derived<SUP>=20
</SUP>cells<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R67-1266=
15"><SUP>67</SUP></A>;=20
however, multiple examples of SCs giving rise to cells<SUP> =
</SUP>normally found=20
in other tissues have become available. In some<SUP> </SUP>cases, both =
the=20
original SCs and the cells to which they give<SUP> </SUP>rise derive =
from the=20
same embryonic germ layer (intragerm layer<SUP> </SUP>conversion). For =
instance,=20
intramesoderm conversion has been<SUP> </SUP>documented by showing the =
genesis=20
of skeletal<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R68-1266=
15"><SUP>68</SUP></A>=20
or cardiac muscle<SUP> </SUP>cells from bone marrow cells.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R69-1266=
15"><SUP>69</SUP></A>=20
Similarly, muscle precursors<SUP> </SUP>can give rise to hematopoietic =
cells,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R70-1266=
15"><SUP>70=9672</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R71-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R72-1266=
15"></A>although<SUP>=20
</SUP>it has now been shown that the original muscle population =
undergoing<SUP>=20
</SUP>conversion are Sca-1 and CD45-positive cells, which are =
hemopoietic<SUP>=20
</SUP>in origin.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R71-1266=
15"><SUP>71,73</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R73-1266=
15"></A>Finally,=20
muscle satellite cells retain an osteogenic<SUP> </SUP>and adipogenic=20
differentiation potential that is normally retrieved<SUP> </SUP>in=20
mesoderm-derived stromal cells.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R74-1266=
15"><SUP>74</SUP></A><SUP>=20
</SUP>
<P>More striking examples of transgerm layer conversion=97hereby<SUP> =
</SUP>also=20
defined as transdifferentiation=97in which SCs and<SUP> </SUP>their =
progeny belong=20
to developmentally unrelated cell lineages<SUP> </SUP>have been reported =
(<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#TBL1">Ta=
ble</A>).=20
Thus, mesoderm-derived mesenchymal<SUP> </SUP>stem cells appear to =
generate=20
astrocytes and neurons, both in<SUP> </SUP>vivo<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R75-1266=
15"><SUP>75</SUP></A>=20
and in vitro,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R76-1266=
15"><SUP>76,77</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R77-1266=
15"></A>and=20
bone marrow SCs can give rise<SUP> </SUP>to endoderm-derived liver =
cells.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R78-1266=
15"><SUP>78,79</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R79-1266=
15"></A>Of=20
note, Wagers et al<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R80-1266=
15"><SUP>80</SUP></A><SUP>=20
</SUP>have recently demonstrated that, in the absence of a =
tissue-specific<SUP>=20
</SUP>lesion, there is not appreciable contribution of single =
repopulating<SUP>=20
</SUP>hematopoietic stem cell to nonhemopoietic tissues, suggesting<SUP> =

</SUP>that the production of nonhemopoietic cell types is not a=20
physiological<SUP> </SUP>function of HSCs. Nonetheless, in the presence =
of=20
sustained<SUP> </SUP>damage as caused by lethal irradiation, adult bone =
marrow=20
cells<SUP> </SUP>were found to integrate and differentiate within the =
brain=20
tissue<SUP> </SUP>after systemic injection. In these mice, 0.2% to 0.3% =
of=20
the<SUP> </SUP>total neurons in the olfactory bulbs appeared to derive =
from<SUP>=20
</SUP>the bone marrow cells.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R81-1266=
15"><SUP>81</SUP></A>=20
In a similar study, bone marrow cells<SUP> </SUP>from wild-type male =
mice were=20
injected intraperitoneally in<SUP> </SUP>PU.1-mutant, immunodeficient =
females.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R82-1266=
15"><SUP>82</SUP></A>=20
In these animals, 0.2%<SUP> </SUP>to 2.3% of the male cells found within =
the=20
brain parenchyma<SUP> </SUP>expressed neuronal markers.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R82-1266=
15"><SUP>82,83</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R83-1266=
15"></A>Nonetheless,=20
a recent report<SUP> </SUP>by Castro et al<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R84-1266=
15"><SUP>84</SUP></A>=20
has questioned the "blood-into-brain" conversion.<SUP> </SUP>These =
authors=20
failed in detecting side population or unfractionated<SUP> </SUP>donor =
bone=20
marrow cells integration in the brain of lethally<SUP> </SUP>irradiated =
mice=20
even after injury. Importantly, in the same<SUP> </SUP>experimental =
model,=20
blood-into-muscle conversion appeared to<SUP> </SUP>take place. At =
present, this=20
issue remains open for discussion,<SUP> </SUP>although it is perhaps =
possible to=20
infer that we are dealing<SUP> </SUP>with a rather rare phenomenon that =
takes=20
place only under specific<SUP> </SUP>conditions with a low frequency, =
whose=20
detection may be elusive<SUP> </SUP>under certain circumstances, but =
which seems=20
to be effective<SUP> </SUP>also in humans.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R85-1266=
15"><SUP>85</SUP></A><SUP>=20
</SUP>
<P><A name=3DTBL1><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><STRONG>View =
this=20
            table:</STRONG><BR><NOBR><A=20
            =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598/TBL1">[i=
n=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View table in a separate =
window'; return true"=20
            onclick=3D"startTarget('TBL1', 500, 400); =
this.href=3D'/cgi/content-nw/full/92/6/598/TBL1'"=20
            =
href=3D"http://circres.ahajournals.org/cgi/content-nw/full/92/6/598/TBL1"=
=20
            target=3DTBL1>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Table 1.</B> <B>Somatic Stem =
Cells Give=20
            Rise to Mature Progeny That May Belong to Other Tissues and =
Organs,=20
            Also of a Distinct Embryological Origin</B>=20
  </TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>
<P>A similar situation has arisen in a neighboring area that is<SUP> =
</SUP>the=20
field of investigation in which the opposite phenomenon,<SUP> </SUP>ie,=20
brain-to-blood conversion, is studied. The initial discovery<SUP> =
</SUP>that=20
transgerm layer differentiation can occur in adult mammals<SUP> =
</SUP>came from=20
cells that were derived from the adult brain. In 1999,<SUP> </SUP>we =
reported=20
that clonally derived adult NSCs could give rise<SUP> </SUP>to =
hematopoietic=20
cells in vivo.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R5-12661=
5"><SUP>5</SUP></A>=20
In these experiments, the progeny<SUP> </SUP>of genetically tagged (ie,=20
constitutively expressing =DF-galactosidase,<SUP> </SUP>the product of =
the=20
bacterial <I>LacZ</I> gene), single NSCs were injected<SUP> </SUP>into=20
sublethally irradiated mice. NSCs integrate into many of<SUP> </SUP>the =
host=20
hematopoietic tissues, including spleen, thymus, and<SUP> </SUP>bone =
marrow and=20
gave rise to various types of blood progenitors.<SUP> </SUP>These =
progenitors=20
did eventually differentiate into a wide range<SUP> </SUP>of blood =
cells,=20
including megacaryocytes, granulocytes, macrophages,<SUP> </SUP>and B- =
and=20
T-lymphocytes; however, erythroid cells were not<SUP> </SUP>observed.=20
Furthermore, although not described in the initial<SUP> </SUP>study (R. =
Rietze,=20
C.R. Bjornson, A.L. Vescovi, unpublished observations,<SUP> </SUP>2002), =
NSCs=20
increased viability in recipient animals, suggesting<SUP> </SUP>that =
they may=20
partially reconstitute and, in fact, rescue lethally<SUP> =
</SUP>irradiated=20
animals. It is worth noting that neurohemopoietic<SUP> </SUP>conversion =
has now=20
been documented also by using human NSCs.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R7-12661=
5"><SUP>7</SUP></A><SUP>=20
</SUP>These cells were transplanted into SCID-Hu mice, which carry<SUP>=20
</SUP>transplanted human fetal bone and thymic fragments, thus =
providing<SUP>=20
</SUP>physiologically relevant human bone marrow and thymic=20
microenvironments.<SUP> </SUP>Under these conditions, human NSCs were =
able to=20
establish long-term<SUP> </SUP>hemopoiesis, as shown by serial =
reconstitution=20
experiments.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R7-12661=
5"><SUP>7</SUP></A><SUP>=20
</SUP>In further support of brain into blood conversion, a recent<SUP>=20
</SUP>work has provided evidence that hematopoietic epigenetic =
factors<SUP>=20
</SUP>can induce human fetal neural tissues to give rise to blood<SUP>=20
</SUP>cells in vitro and that this wider lineage potential is=20
characteristic<SUP> </SUP>of the AC133-positive fraction.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R86-1266=
15"><SUP>86</SUP></A><SUP>=20
</SUP>
<P>Rather peculiar circumstances appear to be necessary for the<SUP>=20
</SUP>expression of the latent, broad developmental potential of =
NSCs<SUP>=20
</SUP>that underlies neuromesodermal transdifferentiation. First,<SUP> =
</SUP>it=20
appears that only bona fide stem cells can undergo =
transdifferentiation.<SUP>=20
</SUP>As described in Galli et al,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R6-12661=
5"><SUP>6</SUP></A>=20
only SVZ cells, but not cells<SUP> </SUP>from regions that do not appear =
to=20
contain actual stem cells,<SUP> </SUP>such as the striatum and the =
cerebral=20
cortex, undergo neuromyogenic<SUP> </SUP>conversion. This was confirmed =
by=20
Rietze et al,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R9-12661=
5"><SUP>9</SUP></A>=20
who enriched<SUP> </SUP>their cultures for NSCs by cell surface markers=20
(PNA<SUP>lo</SUP>/HSA<SUP>lo</SUP>)<SUP> </SUP>and showed how this =
resulted in=20
an increased neuromyogenic conversion<SUP> </SUP>rate=97from 2.5%<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R6-12661=
5"><SUP>6</SUP></A>=20
to 57% of the total cells. Furthermore,<SUP> </SUP>when the =
differentiated=20
progeny of NSCs were exposed to the<SUP> </SUP>same cues that induce =
myogenesis=20
in enriched NSC cultures, negligible<SUP> </SUP>conversion to skeletal =
muscle,=20
if any, was observed.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R6-12661=
5"><SUP>6</SUP></A><SUP>=20
</SUP>
<P>The fact that only NSCs, but not their differentiated neuronal<SUP> =
</SUP>or=20
glial progeny, can give rise to nonneural cells<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R6-12661=
5"><SUP>6</SUP></A>=20
highlights<SUP> </SUP>an important difference between this phenomenon =
and=20
transdifferentiation<SUP> </SUP>as conceived in a classical view. In =
fact,=20
transdifferentiation<SUP> </SUP>implies the ability of differentiated =
cells to=20
acquire a new<SUP> </SUP>identity by turning off one set of =
lineage-specific=20
genes and<SUP> </SUP>activating genes of another differentiated cell =
type. The=20
two<SUP> </SUP>sets of antigens sometimes colocalize in cells undergoing =

transdifferentiation.<SUP> </SUP>Conversely, transgerm layer =
differentiation=20
seems to reflect<SUP> </SUP>the de novo expression of a broader =
developmental=20
potential<SUP> </SUP>of NSCs that may become evident only under peculiar =

conditions.<SUP> </SUP>Accordingly, no molecular and biochemical =
overlapping of=20
specific<SUP> </SUP>neural and nonneural markers were ever observed in =
either=20
NSCs<SUP> </SUP>or their nonneural progeny. Thus, markers of =
hematopoietic=20
precursors<SUP> </SUP>were not detected in NSCs before they were =
injected into=20
injured<SUP> </SUP>animals,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R5-12661=
5"><SUP>5</SUP></A>=20
and expression of muscle determination factors or<SUP> </SUP>other =
muscle=20
differentiation markers such as MyoD, Myf5, myogenin,<SUP> </SUP>and =
myosin was=20
never observed in NSCs before their exposure<SUP> </SUP>to myogenic=20
environments.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R6-12661=
5"><SUP>6</SUP></A>=20
Similarly, lack of expression of<SUP> </SUP>mesodermal and endodermal =
antigens,=20
such as TROMA-1, was detected<SUP> </SUP>in NSCs before injection into =
the=20
developing blastula,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R87-1266=
15"><SUP>87</SUP></A>=20
yet<SUP> </SUP>these cells can give rise to derivatives from both these=20
germ<SUP> </SUP>layers.<SUP> </SUP>
<P>It can be speculated that, in order to undergo transgerm layer<SUP>=20
</SUP>differentiation, NSCs ought to be exposed to =
microenvironments<SUP>=20
</SUP>that contain rather peculiar, as yet unidentified cues. CNS<SUP>=20
</SUP>stem cells have been shown to repopulate the injured =
hemopoietic<SUP>=20
</SUP>system<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R5-12661=
5"><SUP>5</SUP></A>=20
and muscles.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R6-12661=
5"><SUP>6</SUP></A>=20
Similarly, bone marrow cells regenerate<SUP> </SUP>the muscle and =
liver<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R68-1266=
15"><SUP>68,78</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R78-1266=
15"></A>only=20
in the presence of an injury.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R80-1266=
15"><SUP>80</SUP></A><SUP>=20
</SUP>Hence, it can be argued that specific instructive cues may =
become<SUP>=20
</SUP>available during the early and regenerative phases that =
follow<SUP>=20
</SUP>an injury in a given adult tissue, which may resemble those<SUP>=20
</SUP>found in embryonic development. Importantly, recent data =
suggest<SUP>=20
</SUP>that transgerm layer differentiation might be an integral =
part<SUP>=20
</SUP>of tissue regeneration when happening in a physiological =
context,<SUP>=20
</SUP>like the regenerating tail in amphibians.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R88-1266=
15"><SUP>88</SUP></A>=20
In this system,<SUP> </SUP>neuroectodermal radial glial cells, which =
normally=20
regenerate<SUP> </SUP>the spinal cord after tail amputation, also =
contribute to=20
mesoderm<SUP> </SUP>lineages such as cartilage and, more intriguingly, =
muscle.=20
This<SUP> </SUP>study suggests that the existence of a blastema (ie,=20
undifferentiated<SUP> </SUP>proliferative cells) in a regenerative =
milieu is=20
most likely<SUP> </SUP>accountable for this phenomenon, which resembles =
or can=20
be considered<SUP> </SUP>neuromesodermal transdifferentiation. One =
significant=20
hurdle<SUP> </SUP>in the identification of the cues involved in=20
neuromesodermal<SUP> </SUP>conversion depends on the fact that most of =
the=20
models used<SUP> </SUP>rely on in vivo assays. Yet, in vitro models of=20
neuromesodermic<SUP> </SUP>conversion are now available that allow for =
some=20
tentative hypotheses<SUP> </SUP>to be drawn.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R6-12661=
5"><SUP>6</SUP></A>=20
Using these systems, it has emerged that neuromesodermal<SUP> =
</SUP>conversion=20
could only be observed when NSCs were cocultured<SUP> </SUP>with C2C12 =
myogenic=20
cells or with primary myoblasts=97and<SUP> </SUP>never with other cell =
types.=20
Furthermore, when NSCs underwent<SUP> </SUP>myogenic induction as =
clustered=20
cells into neurospheres, the<SUP> </SUP>proportion of cells that =
converted to=20
skeletal muscle dropped<SUP> </SUP>by almost 80% as compared with =
dissociated=20
cells. Thus, when<SUP> </SUP>neural cells are grouped together, =
neural-to-neural=20
signals<SUP> </SUP>override the myoblast-derived myogenic cues, blocking =

neuromyogenic<SUP> </SUP>conversion. Hence, some type of "neuralizing"=20
signal(s), occurring<SUP> </SUP>between neighboring neural cells, =
counteract the=20
induction of<SUP> </SUP>the muscle fate on NSCs. Thus, this phenomenon =
might be=20
interpreted<SUP> </SUP>as a classical "community effect." In vivo, these =
signals=20
can<SUP> </SUP>be found in the extracellular microenvironment that has =
been<SUP>=20
</SUP>perturbed by an injury and may be elicited through a direct<SUP>=20
</SUP>cell-to-cell interaction between the host and the donor =
cells.<SUP> </SUP>
<P>Notably, conversion required direct cell-to-cell contact and<SUP> =
</SUP>did=20
not take place when neural and myogenic cells were physically<SUP>=20
</SUP>separated by a porous membrane, nor when NSCs were exposed to<SUP> =

</SUP>muscle cell=96conditioned medium. This requirement might<SUP> =
</SUP>suggest=20
that spontaneous cell fusion between inducing and induced<SUP> =
</SUP>cells might=20
account for neuromyogenic conversion in this system.<SUP> </SUP>Although =

specific experiments based on cell selection with transgenic<SUP> =
</SUP>markers=20
need to be undertaken to completely rule out this possibility,<SUP> =
</SUP>the=20
presence of a significant number of mononucleated NSC-derived<SUP>=20
</SUP>myocytes in this culture (authors=92 unpublished =
observations,<SUP>=20
</SUP>2003) clearly suggests that cell fusion alone may not justify<SUP> =

</SUP>brain-into-muscle conversion in this system. In this context,<SUP> =

</SUP>it is possible that, in the case of polynucleated NSC-derived<SUP> =

</SUP>myotubes=97in which fusion of NSCs with C2C12 myoblasts<SUP> =
</SUP>does=20
occur=97cell fusion might be responsible for the activation<SUP> =
</SUP>of the=20
muscle-specific reporter gene in NSCs, without the latter<SUP> =
</SUP>undergoing=20
an effective cell fate shift. Yet, we ought to emphasize<SUP> </SUP>that =
the=20
expression of many other muscle-specific markers, such<SUP> </SUP>as =
MyoD,=20
myosin heavy chain (MHC), together with ultrastructural<SUP> =
</SUP>analysis,=20
have been associated with the neural-to-muscle transition<SUP> </SUP>in =
this=20
coculture model.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R6-12661=
5"><SUP>6</SUP></A>=20
Based on these findings, we can infer<SUP> </SUP>that, at least in the =
specific=20
case of neuromesodermal conversion,<SUP> </SUP>cell-to-cell contact is=20
required,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R6-12661=
5"><SUP>6</SUP></A>=20
underlining the necessity<SUP> </SUP>of a direct exchange of information =
between=20
the "inducing" and<SUP> </SUP>the "induced" cells. This may imply the=20
interaction of cell<SUP> </SUP>surface receptors and ligands, the =
formation of=20
gap junction<SUP> </SUP>structures, as well as the involvement of short=20
range=96acting<SUP> </SUP>molecules.<SUP> </SUP>
<P>A fascinating extension of the these findings came from the<SUP>=20
</SUP>observation that NSCs could integrate into many different =
tissues<SUP>=20
</SUP>derived from the three main germ layers on injection into the<SUP> =

</SUP>mouse blastocyst,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R87-1266=
15"><SUP>87</SUP></A>=20
thus behaving as embryonic stem (ES) cells.<SUP> </SUP>Intriguingly, the =

contribution of NSCs to some major mesodermal<SUP> </SUP>lineages, such =
as blood=20
and the skeletal muscle, was never observed<SUP> </SUP>in this work. =
Yet, it was=20
soon clear from additional studies<SUP> </SUP>that both human and mouse =
NSCs do=20
possess the ability to differentiate<SUP> </SUP>into skeletal muscle, =
both in=20
vivo and in vitro<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R6-12661=
5"><SUP>6</SUP></A>=20
(<A =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#FIG4">Fi=
gure=20
4</A>),<SUP> </SUP>and more recent data demonstrated that, on injection =
into=20
the<SUP> </SUP>blastocyst, the very first lineage that NSCs colonize is=20
indeed<SUP> </SUP>the hemopoietic one.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R89-1266=
15"><SUP>89</SUP></A><SUP>=20
</SUP>
<P><A name=3DFIG4><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598/FIG4"><I=
MG=20
            height=3D132 alt=3D" " hspace=3D10=20
            =
src=3D"http://circres.ahajournals.org/content/vol92/issue6/images/small/9=
FF4.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (103K):<BR><NOBR><A=20
            =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598/FIG4">[i=
n=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG4', 590, 491); =
this.href=3D'/cgi/content-nw/full/92/6/598/FIG4'"=20
            =
href=3D"http://circres.ahajournals.org/cgi/content-nw/full/92/6/598/FIG4"=
=20
            target=3DFIG4>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 4. </B>An example of =
the=20
            transdifferentiation capacity of NSCs. Generation of =
skeletal muscle=20
            from NSCs. A, NSCs that were derived from a strain of =
transgenic=20
            mice in which the promoter of the myosin light chain gene =
drives the=20
            expression of =DF-galactosidase in the nucleus of muscle =
cells=20
            activate the transgene when cocultured with C2C12 myocytes.=20
            NSC-derived polynucleated myotubes are identified by the =
nuclear=20
            expression of =DF-galactosidase (X-gal reaction, blue). =
Bar=3D40 =B5m. B,=20
            Clonally derived NSCs from ROSA 26 =
=DF-galactosidase=96expressing=20
            transgenic mice cocultured with C2C12 cells differentiate =
into=20
            myotubes. NSCs expressing =DF-galactosidase immunoreactivity =
are shown=20
            in red (concave arrowhead). C2C12 cells labeled with the=20
            antisarcomeric myosin heavy chain (MHC) antibody are shown =
in green=20
            (arrowhead). NSCs-derived polynucleated myotubes (blue, DAPI =
nuclear=20
            staining) appear as yellow cells due to the overlapping MHC =
and=20
            =DF-galactosidase staining (arrow). Bar=3D20 =B5m.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>
<P>The discrepancy between the various transdifferentiation =
examples<SUP>=20
</SUP>described above and the initial study of NSCs injection into<SUP>=20
</SUP>blastocyst<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R87-1266=
15"><SUP>87</SUP></A>=20
most likely lies in the fact that a number of inductive<SUP> =
</SUP>factors=20
competitively act on NSCs cells in this system. The<SUP> =
</SUP>prevalence of the=20
effect of a given set of instructive cues<SUP> </SUP>that acts on NSCs =
will=20
ultimately depend on the initial, very<SUP> </SUP>variable site of=20
deposition/integration of the cells on their<SUP> </SUP>injection into =
the=20
blastocyst, thus yielding rather variable<SUP> </SUP>results.<SUP> =
</SUP>
<P>Transdifferentiation of somatic stem cells is a hot, highly<SUP>=20
</SUP>debated issue. Particularly, despite the ability of NSCs to<SUP>=20
</SUP>give rise to blood cells has been reported in both human and<SUP>=20
</SUP>mouse cells by 4 independent groups, this phenomenon could =
not<SUP>=20
</SUP>be detected in a recent study.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R90-1266=
15"><SUP>90</SUP></A>=20
This situation exemplifies<SUP> </SUP>the state of confusion that =
plagues the=20
field of neural stem<SUP> </SUP>cells. Particularly, it emphasizes the =
need for=20
standardization<SUP> </SUP>of the terminology adopted when it comes to =
defining=20
NSCs or,<SUP> </SUP>at least, of the tissue culture systems used to grow =
and=20
expand<SUP> </SUP>them. In fact, Morshead et al<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R90-1266=
15"><SUP>90</SUP></A>=20
stated that they failed in reproducing<SUP> </SUP>brain-into-blood =
conversion=20
when using the very same cells and<SUP> </SUP>system used by Bjornson et =
al<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R5-12661=
5"><SUP>5</SUP></A>=20
in their initial finding on neurohemopoietic<SUP> </SUP>conversion. As =
it turns=20
out,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R91-1266=
15"><SUP>91</SUP></A>=20
the culture functional characteristics<SUP> </SUP>described by Morshead =
et al=20
showed that the cells that they<SUP> </SUP>used were different from any =
known=20
NSCs, particularly those<SUP> </SUP>used in previous =
transdifferentiation=20
experiments.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R5-12661=
5"><SUP>5,6</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R6-12661=
5"></A>In=20
fact,<SUP> </SUP>Morshead=92s cultures consistently underwent =
transformation.<SUP>=20
</SUP>This is not a property that was ever observed in studies from<SUP> =

</SUP>many groups. In fact, neither human nor mouse NSCs undergo =
consistent<SUP>=20
</SUP>transformation on subculturing. Over extensive time in =
culture,<SUP>=20
</SUP>these cells exhibit strict growth factor dependency, =
unchanged<SUP>=20
</SUP>growth kinetics and prompt differentiation on removal of =
mitogens.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R56-1266=
15"><SUP>56,58,92,93</SUP></A><SUP>=20
</SUP><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R58-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R92-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R93-1266=
15"></A>Furthermore,=20
a clear difference emerged when comparing the<SUP> </SUP>content of NSCs =
(ie,=20
clonogenic cells in culture) in Morshead<SUP> </SUP>et al cultures with =
that of=20
other groups. It was evident that<SUP> </SUP>less than 1% of the cells =
in=20
Morshead=92s system were NSCs,<SUP> </SUP>whereas Bjornson et al=92s =
data agreed=20
with the literature=92s<SUP> </SUP>data pointing to a minimal standard =
value of=20
20%.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R56-1266=
15"><SUP>56,58,92,93</SUP></A><SUP>=20
</SUP><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R58-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R92-1266=
15"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R93-1266=
15"></A>Bjornson=20
et al contended that the combination of low NSC<SUP> </SUP>number and=20
significant transformation found in the Morshead<SUP> </SUP>et al =
cultures would=20
lead to the transplantation of a negligible<SUP> </SUP>number of NSCs =
and to the=20
negative outcome of these experiments.<SUP> </SUP>
<P>Perhaps, the most knowledgeable conclusion to draw=97also<SUP> =
</SUP>given the=20
constant state of flux of this novel field of investigation=97is<SUP> =
</SUP>that=20
transdifferentiation is an uncommon phenomenon that takes<SUP> =
</SUP>place only=20
under very peculiar circumstances. Because the capacity<SUP> </SUP>to =
undergo=20
transdifferentiation is a characteristic of specific<SUP> </SUP>cell =
types,=20
namely somatic stem cells, and because the latter<SUP> </SUP>normally =
represent=20
a minor fraction of the overall cell population<SUP> </SUP>in vivo or a =
pool=20
whose relative size fluctuates in vitro depending<SUP> </SUP>on culture=20
conditions, detection of transdifferentiation is<SUP> </SUP>rather =
difficult,=20
and requires appropriately refined and sensitive<SUP> =
</SUP>methodologies=20
concerning both cell culturing and fate assessment.<SUP> </SUP>
<P>Recently, explanations that are alternative to =
transdifferentiation<SUP>=20
</SUP>have been invoked to explain, at least in part, the findings<SUP>=20
</SUP>discussed so far. Two distinct studies<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R94-1266=
15"><SUP>94,95</SUP></A>=20
<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R95-1266=
15"></A>reported=20
that adult<SUP> </SUP>stem cells from the CNS and the bone marrow can =
give rise=20
to<SUP> </SUP>cell types as a consequence of cell fusion with ES cells,=20
rather<SUP> </SUP>than by transdifferentiation. The first consideration =
to=20
make<SUP> </SUP>in this context is that these results are limited to =
cell=20
fusion<SUP> </SUP>between adult and embryonic stem cells and do not =
impinge=20
on<SUP> </SUP>the interpretation of data in which adult somatic cells=20
undergo<SUP> </SUP>transdifferentiation in vivo in adult animals, or in =
vitro=20
in<SUP> </SUP>adult cells.<SUP> </SUP>
<P>Yet, it is possible that part of the transdifferentiation events<SUP> =

</SUP>reported so far could be explained by cell fusion. =
Nonetheless,<SUP>=20
</SUP>due to the very low frequency of hybrid formation (an average<SUP> =

</SUP>frequency of 10<SUP>-5</SUP> in the two reports), owing to the =
fact=20
that<SUP> </SUP>ES cells might be more susceptible to cell fusion than=20
somatic<SUP> </SUP>cells and to the observation that the eventual =
polyploid=20
fusion<SUP> </SUP>products are highly unstable, a main role of the sole =
cell=20
fusion<SUP> </SUP>in the conversion of somatic stem cell into different =
cell=20
types<SUP> </SUP>is unlikely.<SUP> </SUP>
<P>In fact, as shown in these two studies and as argued by others,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R96-1266=
15"><SUP>96</SUP></A><SUP>=20
</SUP>at least 30% of the bone marrow=96derived cells injected<SUP> =
</SUP>in vivo=20
transdifferentiated<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R81-1266=
15"><SUP>81</SUP></A>=20
and, similarly, 10% of NSCs cocultured<SUP> </SUP>with inducing =
myoblasts gave=20
rise to muscle cells.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R6-12661=
5"><SUP>6</SUP></A>=20
These frequencies<SUP> </SUP>are orders of magnitude higher than the =
fusion=20
efficiency between<SUP> </SUP>ES and somatic stem cells. Particularly,=20
concerning brain into<SUP> </SUP>muscle conversion, the possibility that =
cell=20
fusion might be<SUP> </SUP>responsible for transdifferentiation seems =
more=20
remote, due<SUP> </SUP>to the following facts: (1) proliferating C2 =
myoblasts=20
are strongly<SUP> </SUP>resistant even to Sendai virus=96mediated cell =
fusion;<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R97-1266=
15"><SUP>97</SUP></A><SUP>=20
</SUP>(2) myoblasts fuse with other myoblasts only when both are =
committed<SUP>=20
</SUP>to differentiation and not when they are still proliferating<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R98-1266=
15"><SUP>98</SUP></A><SUP>=20
</SUP>as in our experimental paradigm;<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R6-12661=
5"><SUP>6</SUP></A>=20
(3) myoblasts do not normally<SUP> </SUP>fuse with nonmyogenic cells<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R98-1266=
15"><SUP>98</SUP></A>=20
and, on this rare event, the fusion<SUP> </SUP>of a myocyte with a =
nonmyogenic=20
cells generally results in the<SUP> </SUP>extinction of muscle-specific=20
properties in the immediate fusion<SUP> </SUP>product,<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R99-1266=
15"><SUP>99</SUP></A>=20
and (4) in our in vitro model, we observed high frequency<SUP> </SUP>of=20
mononucleated NSC-derived myocytes.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R6-12661=
5"><SUP>6</SUP></A>=20
Thus, the chances that<SUP> </SUP>cell fusion between NSCs and inducing=20
myoblasts might occur<SUP> </SUP>spontaneously are quite low.<SUP> =
</SUP>
<P>Whichever interpretation one may adopt, it is cogently clear<SUP> =
</SUP>that=20
the field of transdifferentiation is in its infancy and<SUP> </SUP>that =
this=20
phenomenon is far from being a widely accepted and<SUP> =
</SUP>well-established=20
one. Many questions remain unanswered. The<SUP> </SUP>topic is open to =
heated=20
discussion(s).<SUP> </SUP>
<P><A name=3DSEC6><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
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  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D* hspace=3D5 =
src=3D"http://circres.ahajournals.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Conclusions </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#top"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#ABS"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#BDY"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC1"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>The Forebrain Subventricular...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC2"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>The Nature and Origin...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC3"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Ex Vivo Behavior of...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC4"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Plasticity of NSCs Within...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC5"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Plasticity of NSCs Outside...<BR></A><IMG height=3D9 =
alt=3D* hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Conclusions</FONT><BR><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#BIBL"><I=
MG=20
      height=3D9 alt=3D"down arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>T=
he field=20
of neural stem cells is in a state of rapid growth.<SUP> </SUP>Every =
month, new=20
pieces are added to the puzzle of the neurogenetic<SUP> </SUP>process in =
adult=20
mammals. As expected for such a young field,<SUP> </SUP>stimulating new =
findings=20
go hand in hand with the raising of<SUP> </SUP>new outstanding issues =
that heat=20
the debate around these cells.<SUP> </SUP>This area is, therefore, in a =
state of=20
rapid flux and will clearly<SUP> </SUP>benefit from the isolation of =
specific=20
antigenic markers that<SUP> </SUP>allow for the univocal identification =
of the=20
NSC and its derivatives.<A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R8-12661=
5"><SUP>8,9,10</SUP></A><SUP>=20
</SUP><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R9-12661=
5"></A><A=20
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#R10-1266=
15"></A>A=20
somewhat more conservative use of the term stem cell as<SUP> =
</SUP>applied to=20
different types of brain precursors would also be<SUP> </SUP>beneficial. =
In this=20
view, studies that aim at unraveling the<SUP> </SUP>relationship between =

candidate stem cells as they are identified<SUP> </SUP>in vitro and in =
vivo will=20
certainly provide more rigorous criteria<SUP> </SUP>for the =
identification of=20
NSCs.<SUP> </SUP>
<P>Nevertheless, these cells represent one of the most astonishing<SUP>=20
</SUP>discoveries of the last decade. It is intriguing that cells<SUP>=20
</SUP>isolated from what has long been viewed as the most quiescent<SUP> =

</SUP>among the bodily tissues can display such an amazing degree<SUP> =
</SUP>of=20
plasticity and, equally important, such a remarkable growth<SUP> =
</SUP>capacity.=20
The latter properties will certainly provide the necessary<SUP> =
</SUP>basis to=20
unravel the most intimate mechanisms underlining the<SUP> </SUP>genesis =
of=20
neural cells and the process of development, degeneration,<SUP> =
</SUP>and repair=20
in the CNS.<SUP> </SUP>
<P>Finally, the availability of a renewable source of human neural<SUP>=20
</SUP>cells as provided by the establishment of NSC lines promises<SUP> =
</SUP>to=20
open new, and as of yet, unpredictable therapeutic venues<SUP> </SUP>for =
the=20
treatment of neurological disorders.<SUP> </SUP>
<P><A name=3DACK><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D* hspace=3D5 =
src=3D"http://circres.ahajournals.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Acknowledgments </FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>We are =
grateful to=20
the Fondazione Agarini for the continued<SUP> </SUP>support of our =
research on=20
neural stem cells. We thank Sig.<SUP> </SUP>G. Zanutto for assistance =
with=20
drawing.<SUP> </SUP>
<P>Received March 4, 2002; revision received February 4, 2003; accepted =
February=20
25, 2003.
<P><A name=3DBIBL><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D* hspace=3D5 =
src=3D"http://circres.ahajournals.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      References </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#top"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#ABS"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#BDY"><IM=
G=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Introduction<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC1"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>The Forebrain Subventricular...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC2"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>The Nature and Origin...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC3"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Ex Vivo Behavior of...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC4"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Plasticity of NSCs Within...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC5"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Plasticity of NSCs Outside...<BR></A><A=20
      =
href=3D"http://circres.ahajournals.org/cgi/content/full/92/6/598#SEC6"><I=
MG=20
      height=3D9 alt=3D"up arrow" hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Conclusions<BR></A><IMG height=3D9 alt=3D* hspace=3D5=20
      src=3D"http://circres.ahajournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT=20
color=3D#464c53>References</FONT><BR></FONT></TH></TR></TBODY></TABLE>&nb=
sp;<BR>
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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width=3D25><BR></TD>
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width=3D25><BR></TD>
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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width=3D25><BR></TD>
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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    var docurl =3D '/htj/HWTree.html?catid=3D';=0A=
    var apps =3D null;=0A=
    var reload =3D true;=0A=
=0A=
    self.name =3D selfname;=0A=
=0A=
    if (isPlatformOk())=0A=
    {    =0A=
        // see if window already exists=0A=
        if (win1 =3D=3D null)=0A=
        {=0A=
            win1 =3D window.open('', winname, winfeatures);=0A=
        }=0A=
   =0A=
        if (win1 !=3D null)=0A=
        {=0A=
            if (!win1.closed)=0A=
            {=0A=
                doc =3D win1.document;=0A=
                if (doc !=3D null)=0A=
                {=0A=
                    title =3D doc.title;=0A=
                    if ((title !=3D null) && (title !=3D ''))=0A=
                        reload =3D false;=0A=
                }=0A=
            }=0A=
            if (reload)=0A=
            {=0A=
                docurl =3D docurl + catid;=0A=
                win1 =3D window.open(docurl, winname, winfeatures);=0A=
            }=0A=
            else=0A=
            {=0A=
                apps =3D doc.applets;=0A=
                if (apps !=3D null)=0A=
                    apps[0].centerCatId(catid);=0A=
            }=0A=
        }=0A=
    }=0A=
    else=0A=
    {=0A=
        alert('Cannot launch TopicMap applet.\nRequires Java-enabled web =
browser with\nat least Java 1.1 and AWT 1.1.5.');=0A=
        window.open("/help/hbt/#cant", "_blank");=0A=
    }=0A=
}=0A=
=0A=
function getCatId ()=0A=
{=0A=
    var myUrl =3D document.location;=0A=
    var search =3D myUrl.search;=0A=
=0A=
    if (search !=3D '')=0A=
    {=0A=
        var strObj =3D new String(search);=0A=
        var k;=0A=
     =0A=
        k =3D strObj.indexOf('catid=3D', 0);=0A=
        if (k >=3D 0)=0A=
        {=0A=
            catid =3D strObj.substring(k + 6);=0A=
        }=0A=
    }=0A=
}=0A=
=0A=
function makeApplet ()=0A=
{=0A=
    document.write('<applet code=3D"HWTree.HyperTreeApp" =
archive=3DHWTree.jar WIDTH=3D600 HEIGHT=3D360 MAYSCRIPT>\n');=0A=
    document.write('<PARAM NAME=3Ddataset1         =
VALUE=3D"data/AHA.stc">\n');=0A=
    document.write('<PARAM NAME=3Dtopicurl         VALUE=3D"' + selfurl =
+ 'cgi/bbtBrowse">\n');=0A=
    document.write('<PARAM NAME=3Dcaturl           VALUE=3D"' + selfurl =
+ 'cgi/bbtBrowse?subdir_name=3Dahajournals_bbt&category=3D">\n');=0A=
    document.write('<PARAM NAME=3Dresultwin        VALUE=3D"' + selfname =
+ '">\n');=0A=
    document.write('<PARAM NAME=3Dhelpurl          VALUE=3D"' + selfurl =
+ 'help/hbt/">\n');=0A=
    document.write('<PARAM NAME=3Dstartcatid       VALUE=3D"' + catid + =
'">\n');=0A=
    document.write('<PARAM NAME=3Dthumbnail_dir    VALUE=3D"images">\n');=0A=
    document.write('<PARAM NAME=3Droot_image       =
VALUE=3D"images/hwhack.gif">\n');=0A=
    document.write('<PARAM NAME=3Dfont_size        VALUE=3D"12">\n');=0A=
    document.write('<PARAM NAME=3Dset_thumbnails   VALUE=3D"FALSE">\n');=0A=
    document.write('<PARAM NAME=3Dnode_shape       =
VALUE=3D"RECTANGLE">\n');=0A=
    document.write('<PARAM NAME=3Dnode_text_pos    VALUE=3D"TOP">\n');=0A=
    document.write('<PARAM NAME=3Dbackground_color VALUE=3D"blue">\n');=0A=
    document.write('<PARAM NAME=3Dnode_color       VALUE=3D"black">\n');=0A=
    document.write('<PARAM NAME=3Dtext_color       VALUE=3D"white">\n');=0A=
    document.write('<PARAM NAME=3Dtext_rect        VALUE=3D"TRUE">\n');=0A=
    document.write('<PARAM NAME=3Ddisplay_images   VALUE=3D"FALSE">\n');=0A=
    document.write('<PARAM NAME=3Dorientation      VALUE=3D"RADIAL">\n');=0A=
    document.write('</applet>\n');=0A=
}=0A=

------=_NextPart_000_0000_01C85938.DD0370D0
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://circres.ahajournals.org/javascript/ajax/xmlhttprequest.js

/*=0A=
=0A=
Cross-Browser XMLHttpRequest v1.2=0A=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=0A=
=0A=
Emulate Gecko 'XMLHttpRequest()' functionality in IE and Opera. Opera =
requires=0A=
the Sun Java Runtime Environment <http://www.java.com/>.=0A=
=0A=
by Andrew Gregory=0A=
http://www.scss.com.au/family/andrew/webdesign/xmlhttprequest/=0A=
=0A=
This work is licensed under the Creative Commons Attribution License. To =
view a=0A=
copy of this license, visit =
http://creativecommons.org/licenses/by-sa/2.5/ or=0A=
send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, =
California=0A=
94305, USA.=0A=
=0A=
Attribution: Leave my name and web address in this script intact.=0A=
=0A=
Not Supported in Opera=0A=
----------------------=0A=
* user/password authentication=0A=
* responseXML data member=0A=
=0A=
Not Fully Supported in Opera=0A=
----------------------------=0A=
* async requests=0A=
* abort()=0A=
* getAllResponseHeaders(), getAllResponseHeader(header)=0A=
=0A=
*/=0A=
// IE support=0A=
if (window.ActiveXObject && !window.XMLHttpRequest) {=0A=
  window.XMLHttpRequest =3D function() {=0A=
    var msxmls =3D new Array(=0A=
      'Msxml2.XMLHTTP.5.0',=0A=
      'Msxml2.XMLHTTP.4.0',=0A=
      'Msxml2.XMLHTTP.3.0',=0A=
      'Msxml2.XMLHTTP',=0A=
      'Microsoft.XMLHTTP');=0A=
    for (var i =3D 0; i < msxmls.length; i++) {=0A=
      try {=0A=
        return new ActiveXObject(msxmls[i]);=0A=
      } catch (e) {=0A=
      }=0A=
    }=0A=
    return null;=0A=
  };=0A=
}=0A=
// Gecko support=0A=
/* ;-) */=0A=
// Opera support=0A=
if (window.opera && !window.XMLHttpRequest) {=0A=
  window.XMLHttpRequest =3D function() {=0A=
    this.readyState =3D 0; // =
0=3Duninitialized,1=3Dloading,2=3Dloaded,3=3Dinteractive,4=3Dcomplete=0A=
    this.status =3D 0; // HTTP status codes=0A=
    this.statusText =3D '';=0A=
    this._headers =3D [];=0A=
    this._aborted =3D false;=0A=
    this._async =3D true;=0A=
    this._defaultCharset =3D 'ISO-8859-1';=0A=
    this._getCharset =3D function() {=0A=
      var charset =3D _defaultCharset;=0A=
      var contentType =3D =
this.getResponseHeader('Content-type').toUpperCase();=0A=
      val =3D contentType.indexOf('CHARSET=3D');=0A=
      if (val !=3D -1) {=0A=
        charset =3D contentType.substring(val);=0A=
      }=0A=
      val =3D charset.indexOf(';');=0A=
      if (val !=3D -1) {=0A=
        charset =3D charset.substring(0, val);=0A=
      }=0A=
      val =3D charset.indexOf(',');=0A=
      if (val !=3D -1) {=0A=
        charset =3D charset.substring(0, val);=0A=
      }=0A=
      return charset;=0A=
    };=0A=
    this.abort =3D function() {=0A=
      this._aborted =3D true;=0A=
    };=0A=
    this.getAllResponseHeaders =3D function() {=0A=
      return this.getAllResponseHeader('*');=0A=
    };=0A=
    this.getAllResponseHeader =3D function(header) {=0A=
      var ret =3D '';=0A=
      for (var i =3D 0; i < this._headers.length; i++) {=0A=
        if (header =3D=3D '*' || this._headers[i].h =3D=3D header) {=0A=
          ret +=3D this._headers[i].h + ': ' + this._headers[i].v + '\n';=0A=
        }=0A=
      }=0A=
      return ret;=0A=
    };=0A=
    this.getResponseHeader =3D function(header) {=0A=
      var ret =3D getAllResponseHeader(header);=0A=
      var i =3D ret.indexOf('\n');=0A=
      if (i !=3D -1) {=0A=
        ret =3D ret.substring(0, i);=0A=
      }=0A=
      return ret;=0A=
    };=0A=
    this.setRequestHeader =3D function(header, value) {=0A=
      this._headers[this._headers.length] =3D {h:header, v:value};=0A=
    };=0A=
    this.open =3D function(method, url, async, user, password) {=0A=
      this.method =3D method;=0A=
      this.url =3D url;=0A=
      this._async =3D true;=0A=
      this._aborted =3D false;=0A=
      this._headers =3D [];=0A=
      if (arguments.length >=3D 3) {=0A=
        this._async =3D async;=0A=
      }=0A=
      if (arguments.length > 3) {=0A=
        opera.postError('XMLHttpRequest.open() - user/password not =
supported');=0A=
      }=0A=
      this.readyState =3D 1;=0A=
      if (this.onreadystatechange) {=0A=
        this.onreadystatechange();=0A=
      }=0A=
    };=0A=
    this.send =3D function(data) {=0A=
      if (!navigator.javaEnabled()) {=0A=
        alert("XMLHttpRequest.send() - Java must be installed and =
enabled.");=0A=
        return;=0A=
      }=0A=
      if (this._async) {=0A=
        setTimeout(this._sendasync, 0, this, data);=0A=
        // this is not really asynchronous and won't execute until the =
current=0A=
        // execution context ends=0A=
      } else {=0A=
        this._sendsync(data);=0A=
      }=0A=
    }=0A=
    this._sendasync =3D function(req, data) {=0A=
      if (!req._aborted) {=0A=
        req._sendsync(data);=0A=
      }=0A=
    };=0A=
    this._sendsync =3D function(data) {=0A=
      this.readyState =3D 2;=0A=
      if (this.onreadystatechange) {=0A=
        this.onreadystatechange();=0A=
      }=0A=
      // open connection=0A=
      var url =3D new java.net.URL(new =
java.net.URL(window.location.href), this.url);=0A=
      var conn =3D url.openConnection();=0A=
      for (var i =3D 0; i < this._headers.length; i++) {=0A=
        conn.setRequestProperty(this._headers[i].h, this._headers[i].v);=0A=
      }=0A=
      this._headers =3D [];=0A=
      if (this.method =3D=3D 'POST') {=0A=
        // POST data=0A=
        conn.setDoOutput(true);=0A=
        var wr =3D new =
java.io.OutputStreamWriter(conn.getOutputStream(), this._getCharset());=0A=
        wr.write(data);=0A=
        wr.flush();=0A=
        wr.close();=0A=
      }=0A=
      // read response headers=0A=
      // NOTE: the getHeaderField() methods always return nulls for me :(=0A=
      var gotContentEncoding =3D false;=0A=
      var gotContentLength =3D false;=0A=
      var gotContentType =3D false;=0A=
      var gotDate =3D false;=0A=
      var gotExpiration =3D false;=0A=
      var gotLastModified =3D false;=0A=
      for (var i =3D 0; ; i++) {=0A=
        var hdrName =3D conn.getHeaderFieldKey(i);=0A=
        var hdrValue =3D conn.getHeaderField(i);=0A=
        if (hdrName =3D=3D null && hdrValue =3D=3D null) {=0A=
          break;=0A=
        }=0A=
        if (hdrName !=3D null) {=0A=
          this._headers[this._headers.length] =3D {h:hdrName, =
v:hdrValue};=0A=
          switch (hdrName.toLowerCase()) {=0A=
            case 'content-encoding': gotContentEncoding =3D true; break;=0A=
            case 'content-length'  : gotContentLength   =3D true; break;=0A=
            case 'content-type'    : gotContentType     =3D true; break;=0A=
            case 'date'            : gotDate            =3D true; break;=0A=
            case 'expires'         : gotExpiration      =3D true; break;=0A=
            case 'last-modified'   : gotLastModified    =3D true; break;=0A=
          }=0A=
        }=0A=
      }=0A=
      // try to fill in any missing header information=0A=
      var val;=0A=
      val =3D conn.getContentEncoding();=0A=
      if (val !=3D null && !gotContentEncoding) =
this._headers[this._headers.length] =3D {h:'Content-encoding', v:val};=0A=
      val =3D conn.getContentLength();=0A=
      if (val !=3D -1 && !gotContentLength) =
this._headers[this._headers.length] =3D {h:'Content-length', v:val};=0A=
      val =3D conn.getContentType();=0A=
      if (val !=3D null && !gotContentType) =
this._headers[this._headers.length] =3D {h:'Content-type', v:val};=0A=
      val =3D conn.getDate();=0A=
      if (val !=3D 0 && !gotDate) this._headers[this._headers.length] =
=3D {h:'Date', v:(new Date(val)).toUTCString()};=0A=
      val =3D conn.getExpiration();=0A=
      if (val !=3D 0 && !gotExpiration) =
this._headers[this._headers.length] =3D {h:'Expires', v:(new =
Date(val)).toUTCString()};=0A=
      val =3D conn.getLastModified();=0A=
      if (val !=3D 0 && !gotLastModified) =
this._headers[this._headers.length] =3D {h:'Last-modified', v:(new =
Date(val)).toUTCString()};=0A=
      // read response data=0A=
      var reqdata =3D '';=0A=
      var stream =3D conn.getInputStream();=0A=
      if (stream) {=0A=
        var reader =3D new java.io.BufferedReader(new =
java.io.InputStreamReader(stream, this._getCharset()));=0A=
        var line;=0A=
        while ((line =3D reader.readLine()) !=3D null) {=0A=
          if (this.readyState =3D=3D 2) {=0A=
            this.readyState =3D 3;=0A=
            if (this.onreadystatechange) {=0A=
              this.onreadystatechange();=0A=
            }=0A=
          }=0A=
          reqdata +=3D line + '\n';=0A=
        }=0A=
        reader.close();=0A=
        this.status =3D 200;=0A=
        this.statusText =3D 'OK';=0A=
        this.responseText =3D reqdata;=0A=
        this.readyState =3D 4;=0A=
        if (this.onreadystatechange) {=0A=
          this.onreadystatechange();=0A=
        }=0A=
        if (this.onload) {=0A=
          this.onload();=0A=
        }=0A=
      } else {=0A=
        // error=0A=
        this.status =3D 404;=0A=
        this.statusText =3D 'Not Found';=0A=
        this.responseText =3D '';=0A=
        this.readyState =3D 4;=0A=
        if (this.onreadystatechange) {=0A=
          this.onreadystatechange();=0A=
        }=0A=
        if (this.onerror) {=0A=
          this.onerror();=0A=
        }=0A=
      }=0A=
    };=0A=
  };=0A=
}=0A=
// ActiveXObject emulation=0A=
if (!window.ActiveXObject && window.XMLHttpRequest) {=0A=
  window.ActiveXObject =3D function(type) {=0A=
    switch (type.toLowerCase()) {=0A=
      case 'microsoft.xmlhttp':=0A=
      case 'msxml2.xmlhttp':=0A=
      case 'msxml2.xmlhttp.3.0':=0A=
      case 'msxml2.xmlhttp.4.0':=0A=
      case 'msxml2.xmlhttp.5.0':=0A=
        return new XMLHttpRequest();=0A=
    }=0A=
    return null;=0A=
  };=0A=
}=0A=

------=_NextPart_000_0000_01C85938.DD0370D0
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://circres.ahajournals.org/javascript/ajax/utility.js

/************************************************************************=
*****=0A=
 * javascript/ajax/utility.js=0A=
 *=0A=
 * Utility functions for working with XMLHttpRequest data.=0A=
 *=0A=
 * Copyright 2006 Board of Trustees of the Leland Stanford Junior =
University.=0A=
 =
*************************************************************************=
***/=0A=
=0A=
/*=0A=
 * Copy XML nodes into an HTMLElement. This effectively=0A=
 * clones XML markup which uses XHTML naming conventions=0A=
 * into an HTML DOM.=0A=
 */=0A=
function copy_xml_to_html(src, dst) {=0A=
  if (src.nodeType =3D=3D 1) { /* Node.ELEMENT_NODE */=0A=
    var e =3D document.createElement(src.nodeName);=0A=
    for (var i =3D 0; i < src.childNodes.length; i++) {=0A=
	  copy_xml_to_html(src.childNodes[i], e);=0A=
    }=0A=
    for (var i =3D 0; i < src.attributes.length; i++) {=0A=
      var n =3D src.attributes[i].name;=0A=
      var v =3D unescape_xml_string(src.attributes[i].value);      =0A=
      e.setAttribute(n, v);=0A=
      if (n =3D=3D "class") {=0A=
        e.className =3D v;=0A=
      }=0A=
      else if (n =3D=3D "style") {=0A=
        set_css_style(v, e, "");=0A=
      }=0A=
    }=0A=
    dst.appendChild(e);=0A=
  }=0A=
  else if (src.nodeType =3D=3D 3) { /* Node.TEXT_NODE */=0A=
    dst.appendChild(document.createTextNode(src.nodeValue));=0A=
  }=0A=
}=0A=
=0A=
/* =0A=
 * It is unclear that this is the right thing to be calling=0A=
 * from copy_xml_to_html, but it appears that Safari decides=0A=
 * to convert &amp; to the NCR &#35;, and then encodes that=0A=
 * NCR to &%26%2338;.  So, I'm going to treat the DOM Attr=0A=
 * value as a plain string, and run our XML string input=0A=
 * through the decoding routine below.=0A=
 */=0A=
function unescape_xml_string(s) {=0A=
  return s.replace(/&apos;/g, "'")=0A=
          .replace(/&#39;/g,  "'")=0A=
          .replace(/&quot;/g, "\"")=0A=
          .replace(/&#34;/g,  "\"")=0A=
          .replace(/&gt;/g,   ">")=0A=
          .replace(/&#62;/g,  ">")=0A=
          .replace(/&lt;/g,   "<")=0A=
          .replace(/&#60;/g,  "<")=0A=
          .replace(/&amp;/g,  "&")=0A=
          .replace(/&#38;/g,  "&");=0A=
}=0A=
=0A=
/*=0A=
 * Parse set of CSS rules and apply them to an element.=0A=
 * This is quite horrifying, but I'm unable to determine=0A=
 * how else to handle this with IE 6.  FireFox and other=0A=
 * sane browsers let you simply set the style attribute=0A=
 * or use e.style.setProperty(rule, value, priority),=0A=
 * IE 6 appears to have neither of these capabilities..=0A=
 */=0A=
function set_css_style(css, e, priority) {=0A=
  var rules =3D css.split(";");=0A=
  for (var i =3D 0; i < rules.length; i++) {=0A=
    var nvpair =3D rules[i].split(":");=0A=
    if (nvpair.length =3D=3D 2) {=0A=
      try {=0A=
        var name  =3D nvpair[0]; /* style attribute */=0A=
        var value =3D nvpair[1]; /* attribute value */=0A=
  =0A=
        /*=0A=
         * For each possible style attribute, set the=0A=
         * appropriate style property in the element.=0A=
         */=0A=
        if (name =3D=3D "background") {=0A=
           e.style.background =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-attachment") {=0A=
          e.style.backgroundAttachment =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-color") {=0A=
          e.style.backgroundColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-image") {=0A=
          e.style.backgroundImage =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position") {=0A=
          e.style.backgroundPosition =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position-x") {=0A=
          e.style.backgroundPositionX =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position-y") {=0A=
          e.style.backgroundPositionY =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-repeat") {=0A=
          e.style.backgroundRepeat =3D value;=0A=
        }=0A=
        else if (name =3D=3D "behavior") {=0A=
          e.style.behavior =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border") {=0A=
          e.style.border =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom") {=0A=
          e.style.borderBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-color") {=0A=
          e.style.borderBottomColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-style") {=0A=
          e.style.borderBottomStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-width") {=0A=
          e.style.borderBottomWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-collapse") {=0A=
          e.style.borderCollapse =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-color") {=0A=
          e.style.borderColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left") {=0A=
          e.style.borderLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left-color") {=0A=
          e.style.borderLeftColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left-style") {=0A=
          e.style.borderLeftStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left-width") {=0A=
          e.style.borderLeftWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right") {=0A=
          e.style.borderRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right-color") {=0A=
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------=_NextPart_000_0000_01C85938.DD0370D0
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://circres.ahajournals.org/javascript/entrez/callback.js

/************************************************************************=
*****=0A=
 * javascript/entrez/callback.js=0A=
 *=0A=
 * Entrez Linking callback to populate content box.=0A=
 *=0A=
 * Copyright 2006 Board of Trustees of the Leland Stanford Junior =
University.=0A=
 =
*************************************************************************=
***/=0A=
=0A=
/*=0A=
 * Execute callback to fill content box with Entrez Linking information.=0A=
 */=0A=
function entrez_callback(pmid, callback_url) {=0A=
  /*=0A=
   * MSIE 5.5 and below have issues with the JavaScript=0A=
   * used for Entrez Linking. For now we have to disable=0A=
   * the callback until we can track down a proper fix=0A=
   * (or everybody sanely upgrades to version 6 or 7!).=0A=
   */=0A=
  if (navigator) {=0A=
    var appname =3D navigator.appName;=0A=
    if (appname =3D=3D "Microsoft Internet Explorer") {=0A=
      var userAgent =3D navigator["userAgent"];=0A=
      var s =3D "MSIE ";=0A=
      var n =3D -1;      =0A=
      if ((n =3D userAgent.indexOf(s)) !=3D -1) {=0A=
        var v =3D parseFloat(userAgent.substring(n+s.length));=0A=
        if (v < 6) {=0A=
          return;=0A=
        }=0A=
      }=0A=
    }=0A=
  }=0A=
=0A=
  /*=0A=
   * Acquire table row element to update, initiate callback=0A=
   * to update table with Entrez Links.=0A=
   */=0A=
  var tr =3D document.getElementById('entrez_callback_'+pmid);=0A=
  if (!tr) {=0A=
    return;=0A=
  }=0A=
  var req =3D new XMLHttpRequest();=0A=
  if (!req) {=0A=
    return;=0A=
  }=0A=
  req.onreadystatechange =3D function() {=0A=
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=3D=3D 304)) {=0A=
      var src =3D req.responseXML.documentElement;=0A=
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      	copy_xml_to_html(src.childNodes[i], dst);=0A=
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      var tbl =3D tr.parentNode;=0A=
      tbl.replaceChild(dst, tr);=0A=
    }=0A=
  }=0A=
  req.open('GET', callback_url, true);=0A=
  req.send(null);=0A=
}=0A=

------=_NextPart_000_0000_01C85938.DD0370D0
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://www.google-analytics.com/urchin.js

//-- Google Analytics Urchin Module=0A=
//-- Copyright 2007 Google, All Rights Reserved.=0A=
=0A=
//-- Urchin On Demand Settings ONLY=0A=
var _uacct=3D"";			// set up the Urchin Account=0A=
var _userv=3D1;			// service mode (0=3Dlocal,1=3Dremote,2=3Dboth)=0A=
=0A=
//-- UTM User Settings=0A=
var _ufsc=3D1;			// set client info flag (1=3Don|0=3Doff)=0A=
var _udn=3D"auto";		// (auto|none|domain) set the domain name for cookies=0A=
var _uhash=3D"on";		// (on|off) unique domain hash for cookies=0A=
var _utimeout=3D"1800";   	// set the inactive session timeout in seconds=0A=
var _ugifpath=3D"/__utm.gif";	// set the web path to the __utm.gif file=0A=
var _utsp=3D"|";			// transaction field separator=0A=
var _uflash=3D1;			// set flash version detect option (1=3Don|0=3Doff)=0A=
var _utitle=3D1;			// set the document title detect option =
(1=3Don|0=3Doff)=0A=
var _ulink=3D0;			// enable linker functionality (1=3Don|0=3Doff)=0A=
var _uanchor=3D0;			// enable use of anchors for campaign =
(1=3Don|0=3Doff)=0A=
var _utcp=3D"/";			// the cookie path for tracking=0A=
var _usample=3D100;		// The sampling % of visitors to track (1-100).=0A=
=0A=
//-- UTM Campaign Tracking Settings=0A=
var _uctm=3D1;			// set campaign tracking module (1=3Don|0=3Doff)=0A=
var _ucto=3D"15768000";		// set timeout in seconds (6 month default)=0A=
var _uccn=3D"utm_campaign";	// name=0A=
var _ucmd=3D"utm_medium";		// medium (cpc|cpm|link|email|organic)=0A=
var _ucsr=3D"utm_source";		// source=0A=
var _uctr=3D"utm_term";		// term/keyword=0A=
var _ucct=3D"utm_content";	// content=0A=
var _ucid=3D"utm_id";		// id number=0A=
var _ucno=3D"utm_nooverride";	// don't override=0A=
=0A=
//-- Auto/Organic Sources and Keywords=0A=
var _uOsr=3Dnew Array();=0A=
var _uOkw=3Dnew Array();=0A=
_uOsr[0]=3D"google";	_uOkw[0]=3D"q";=0A=
_uOsr[1]=3D"yahoo";	_uOkw[1]=3D"p";=0A=
_uOsr[2]=3D"msn";		_uOkw[2]=3D"q";=0A=
_uOsr[3]=3D"aol";		_uOkw[3]=3D"query";=0A=
_uOsr[4]=3D"aol";		_uOkw[4]=3D"encquery";=0A=
_uOsr[5]=3D"lycos";	_uOkw[5]=3D"query";=0A=
_uOsr[6]=3D"ask";		_uOkw[6]=3D"q";=0A=
_uOsr[7]=3D"altavista";	_uOkw[7]=3D"q";=0A=
_uOsr[8]=3D"netscape";	_uOkw[8]=3D"query";=0A=
_uOsr[9]=3D"cnn";	_uOkw[9]=3D"query";=0A=
_uOsr[10]=3D"looksmart";	_uOkw[10]=3D"qt";=0A=
_uOsr[11]=3D"about";	_uOkw[11]=3D"terms";=0A=
_uOsr[12]=3D"mamma";	_uOkw[12]=3D"query";=0A=
_uOsr[13]=3D"alltheweb";	_uOkw[13]=3D"q";=0A=
_uOsr[14]=3D"gigablast";	_uOkw[14]=3D"q";=0A=
_uOsr[15]=3D"voila";	_uOkw[15]=3D"rdata";=0A=
_uOsr[16]=3D"virgilio";	_uOkw[16]=3D"qs";=0A=
_uOsr[17]=3D"live";	_uOkw[17]=3D"q";=0A=
_uOsr[18]=3D"baidu";	_uOkw[18]=3D"wd";=0A=
_uOsr[19]=3D"alice";	_uOkw[19]=3D"qs";=0A=
_uOsr[20]=3D"yandex";	_uOkw[20]=3D"text";=0A=
_uOsr[21]=3D"najdi";	_uOkw[21]=3D"q";=0A=
_uOsr[22]=3D"aol";	_uOkw[22]=3D"q";=0A=
_uOsr[23]=3D"club-internet"; _uOkw[23]=3D"q";=0A=
_uOsr[24]=3D"mama";	_uOkw[24]=3D"query";=0A=
_uOsr[25]=3D"seznam";	_uOkw[25]=3D"q";=0A=
_uOsr[26]=3D"search";	_uOkw[26]=3D"q";=0A=
_uOsr[27]=3D"szukaj";	_uOkw[27]=3D"szukaj";=0A=
_uOsr[28]=3D"szukaj";	_uOkw[28]=3D"qt";=0A=
_uOsr[29]=3D"netsprint";	_uOkw[29]=3D"q";=0A=
_uOsr[30]=3D"google.interia";	_uOkw[30]=3D"q";=0A=
_uOsr[31]=3D"szukacz";	_uOkw[31]=3D"q";=0A=
_uOsr[32]=3D"yam";	_uOkw[32]=3D"k";=0A=
_uOsr[33]=3D"pchome";	_uOkw[33]=3D"q";=0A=
=0A=
=0A=
//-- Auto/Organic Keywords to Ignore=0A=
var _uOno=3Dnew Array();=0A=
//_uOno[0]=3D"urchin";=0A=
//_uOno[1]=3D"urchin.com";=0A=
//_uOno[2]=3D"www.urchin.com";=0A=
=0A=
//-- Referral domains to Ignore=0A=
var _uRno=3Dnew Array();=0A=
//_uRno[0]=3D".urchin.com";=0A=
=0A=
//-- **** Don't modify below this point ***=0A=
var =
_uff,_udh,_udt,_ubl=3D0,_udo=3D"",_uu,_ufns=3D0,_uns=3D0,_ur=3D"-",_ufno=3D=
0,_ust=3D0,_ubd=3Ddocument,_udl=3D_ubd.location,_udlh=3D"",_uwv=3D"1";=0A=
var _ugifpath2=3D"http://www.google-analytics.com/__utm.gif";=0A=
if (_udl.hash) _udlh=3D_udl.href.substring(_udl.href.indexOf('#'));=0A=
if (_udl.protocol=3D=3D"https:") =
_ugifpath2=3D"https://ssl.google-analytics.com/__utm.gif";=0A=
if (!_utcp || _utcp=3D=3D"") _utcp=3D"/";=0A=
function urchinTracker(page) {=0A=
 if (_udl.protocol=3D=3D"file:") return;=0A=
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 var nx=3D" expires=3D"+_uNx()+";";=0A=
 var dc=3D_ubd.cookie;=0A=
 _udh=3D_uDomain();=0A=
 if (!_uVG()) return;=0A=
 _uu=3DMath.round(Math.random()*2147483647);=0A=
 _udt=3Dnew Date();=0A=
 _ust=3DMath.round(_udt.getTime()/1000);=0A=
 a=3Ddc.indexOf("__utma=3D"+_udh);=0A=
 b=3Ddc.indexOf("__utmb=3D"+_udh);=0A=
 c=3Ddc.indexOf("__utmc=3D"+_udh);=0A=
 if (_udn && _udn!=3D"") { _udo=3D" domain=3D"+_udn+";"; }=0A=
 if (_utimeout && _utimeout!=3D"") {=0A=
  x=3Dnew Date(_udt.getTime()+(_utimeout*1000));=0A=
  x=3D" expires=3D"+x.toGMTString()+";";=0A=
 }=0A=
 if (_ulink) {=0A=
  if (_uanchor && _udlh && _udlh!=3D"") s=3D_udlh+"&";=0A=
  s+=3D_udl.search;=0A=
  if(s && s!=3D"" && s.indexOf("__utma=3D")>=3D0) {=0A=
   if (!(_uIN(a=3D_uGC(s,"__utma=3D","&")))) a=3D"-";=0A=
   if (!(_uIN(b=3D_uGC(s,"__utmb=3D","&")))) b=3D"-";=0A=
   if (!(_uIN(c=3D_uGC(s,"__utmc=3D","&")))) c=3D"-";=0A=
   v=3D_uGC(s,"__utmv=3D","&");=0A=
   z=3D_uGC(s,"__utmz=3D","&");=0A=
   k=3D_uGC(s,"__utmk=3D","&");=0A=
   xx=3D_uGC(s,"__utmx=3D","&");=0A=
   if ((k*1) !=3D ((_uHash(a+b+c+xx+z+v)*1)+(_udh*1))) =
{_ubl=3D1;a=3D"-";b=3D"-";c=3D"-";xx=3D"-";z=3D"-";v=3D"-";}=0A=
   if (a!=3D"-" && b!=3D"-" && c!=3D"-") f=3D1;=0A=
   else if(a!=3D"-") f=3D2;=0A=
  }=0A=
 }=0A=
 if(f=3D=3D1) {=0A=
  _ubd.cookie=3D"__utma=3D"+a+"; path=3D"+_utcp+";"+nx+_udo;=0A=
  _ubd.cookie=3D"__utmb=3D"+b+"; path=3D"+_utcp+";"+x+_udo;=0A=
  _ubd.cookie=3D"__utmc=3D"+c+"; path=3D"+_utcp+";"+_udo;=0A=
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  a=3D_uFixA(s,"&",_ust);=0A=
  _ubd.cookie=3D"__utma=3D"+a+"; path=3D"+_utcp+";"+nx+_udo;=0A=
  _ubd.cookie=3D"__utmb=3D"+_udh+"; path=3D"+_utcp+";"+x+_udo;=0A=
  _ubd.cookie=3D"__utmc=3D"+_udh+"; path=3D"+_utcp+";"+_udo;=0A=
  _ufns=3D1;=0A=
 } else if (a>=3D0 && b>=3D0 && c>=3D0) {=0A=
  _ubd.cookie=3D"__utmb=3D"+_udh+"; path=3D"+_utcp+";"+x+_udo;=0A=
 } else {=0A=
  if (a>=3D0) a=3D_uFixA(_ubd.cookie,";",_ust);=0A=
  else a=3D_udh+"."+_uu+"."+_ust+"."+_ust+"."+_ust+".1";=0A=
  _ubd.cookie=3D"__utma=3D"+a+"; path=3D"+_utcp+";"+nx+_udo;=0A=
  _ubd.cookie=3D"__utmb=3D"+_udh+"; path=3D"+_utcp+";"+x+_udo;=0A=
  _ubd.cookie=3D"__utmc=3D"+_udh+"; path=3D"+_utcp+";"+_udo;=0A=
  _ufns=3D1;=0A=
 }=0A=
 if (_ulink && xx && xx!=3D"" && xx!=3D"-") {=0A=
   xx=3D_uUES(xx);=0A=
   if (xx.indexOf(";")=3D=3D-1) _ubd.cookie=3D"__utmx=3D"+xx+"; =
path=3D"+_utcp+";"+nx+_udo;=0A=
 }=0A=
 if (_ulink && v && v!=3D"" && v!=3D"-") {=0A=
  v=3D_uUES(v);=0A=
  if (v.indexOf(";")=3D=3D-1) _ubd.cookie=3D"__utmv=3D"+v+"; =
path=3D"+_utcp+";"+nx+_udo;=0A=
 }=0A=
 _uInfo(page);=0A=
 _ufns=3D0;=0A=
 _ufno=3D0;=0A=
 if (!page || page=3D=3D"") _uff=3D1;=0A=
}=0A=
function _uInfo(page) {=0A=
 var p,s=3D"",dm=3D"",pg=3D_udl.pathname+_udl.search;=0A=
 if (page && page!=3D"") pg=3D_uES(page,1);=0A=
 _ur=3D_ubd.referrer;=0A=
 if (!_ur || _ur=3D=3D"") { _ur=3D"-"; }=0A=
 else {=0A=
  dm=3D_ubd.domain;=0A=
  if(_utcp && _utcp!=3D"/") dm+=3D_utcp;=0A=
  p=3D_ur.indexOf(dm);=0A=
  if ((p>=3D0) && (p<=3D8)) { _ur=3D"0"; }=0A=
  if (_ur.indexOf("[")=3D=3D0 && =
_ur.lastIndexOf("]")=3D=3D(_ur.length-1)) { _ur=3D"-"; }=0A=
 }=0A=
 s+=3D"&utmn=3D"+_uu;=0A=
 if (_ufsc) s+=3D_uBInfo();=0A=
 if (_uctm) s+=3D_uCInfo();=0A=
 if (_utitle && _ubd.title && _ubd.title!=3D"") =
s+=3D"&utmdt=3D"+_uES(_ubd.title);=0A=
 if (_udl.hostname && _udl.hostname!=3D"") =
s+=3D"&utmhn=3D"+_uES(_udl.hostname);=0A=
 s+=3D"&utmr=3D"+_ur;=0A=
 s+=3D"&utmp=3D"+pg;=0A=
 if ((_userv=3D=3D0 || _userv=3D=3D2) && _uSP()) {=0A=
  var i=3Dnew Image(1,1);=0A=
  i.src=3D_ugifpath+"?"+"utmwv=3D"+_uwv+s;=0A=
  i.onload=3Dfunction() {_uVoid();}=0A=
 }=0A=
 if ((_userv=3D=3D1 || _userv=3D=3D2) && _uSP()) {=0A=
  var i2=3Dnew Image(1,1);=0A=
  =
i2.src=3D_ugifpath2+"?"+"utmwv=3D"+_uwv+s+"&utmac=3D"+_uacct+"&utmcc=3D"+=
_uGCS();=0A=
  i2.onload=3Dfunction() { _uVoid(); }=0A=
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 return;=0A=
}=0A=
function _uVoid() { return; }=0A=
function _uCInfo() {=0A=
 if (!_ucto || _ucto=3D=3D"") { _ucto=3D"15768000"; }=0A=
 if (!_uVG()) return;=0A=
 var =
c=3D"",t=3D"-",t2=3D"-",t3=3D"-",o=3D0,cs=3D0,cn=3D0,i=3D0,z=3D"-",s=3D""=
;=0A=
 if (_uanchor && _udlh && _udlh!=3D"") s=3D_udlh+"&";=0A=
 s+=3D_udl.search;=0A=
 var x=3Dnew Date(_udt.getTime()+(_ucto*1000));=0A=
 var dc=3D_ubd.cookie;=0A=
 x=3D" expires=3D"+x.toGMTString()+";";=0A=
 if (_ulink && !_ubl) {=0A=
  z=3D_uUES(_uGC(s,"__utmz=3D","&"));=0A=
  if (z!=3D"-" && z.indexOf(";")=3D=3D-1) { =
_ubd.cookie=3D"__utmz=3D"+z+"; path=3D"+_utcp+";"+x+_udo; return ""; }=0A=
 }=0A=
 z=3Ddc.indexOf("__utmz=3D"+_udh);=0A=
 if (z>-1) { z=3D_uGC(dc,"__utmz=3D"+_udh,";"); }=0A=
 else { z=3D"-"; }=0A=
 t=3D_uGC(s,_ucid+"=3D","&");=0A=
 t2=3D_uGC(s,_ucsr+"=3D","&");=0A=
 t3=3D_uGC(s,"gclid=3D","&");=0A=
 if ((t!=3D"-" && t!=3D"") || (t2!=3D"-" && t2!=3D"") || (t3!=3D"-" && =
t3!=3D"")) {=0A=
  if (t!=3D"-" && t!=3D"") c+=3D"utmcid=3D"+_uEC(t);=0A=
  if (t2!=3D"-" && t2!=3D"") { if (c !=3D "") c+=3D"|"; =
c+=3D"utmcsr=3D"+_uEC(t2); }=0A=
  if (t3!=3D"-" && t3!=3D"") { if (c !=3D "") c+=3D"|"; =
c+=3D"utmgclid=3D"+_uEC(t3); }=0A=
  t=3D_uGC(s,_uccn+"=3D","&");=0A=
  if (t!=3D"-" && t!=3D"") c+=3D"|utmccn=3D"+_uEC(t);=0A=
  else c+=3D"|utmccn=3D(not+set)";=0A=
  t=3D_uGC(s,_ucmd+"=3D","&");=0A=
  if (t!=3D"-" && t!=3D"") c+=3D"|utmcmd=3D"+_uEC(t);=0A=
  else  c+=3D"|utmcmd=3D(not+set)";=0A=
  t=3D_uGC(s,_uctr+"=3D","&");=0A=
  if (t!=3D"-" && t!=3D"") c+=3D"|utmctr=3D"+_uEC(t);=0A=
  else { t=3D_uOrg(1); if (t!=3D"-" && t!=3D"") =
c+=3D"|utmctr=3D"+_uEC(t); }=0A=
  t=3D_uGC(s,_ucct+"=3D","&");=0A=
  if (t!=3D"-" && t!=3D"") c+=3D"|utmcct=3D"+_uEC(t);=0A=
  t=3D_uGC(s,_ucno+"=3D","&");=0A=
  if (t=3D=3D"1") o=3D1;=0A=
  if (z!=3D"-" && o=3D=3D1) return "";=0A=
 }=0A=
 if (c=3D=3D"-" || c=3D=3D"") { c=3D_uOrg(); if (z!=3D"-" && =
_ufno=3D=3D1)  return ""; }=0A=
 if (c=3D=3D"-" || c=3D=3D"") { if (_ufns=3D=3D1)  c=3D_uRef(); if =
(z!=3D"-" && _ufno=3D=3D1)  return ""; }=0A=
 if (c=3D=3D"-" || c=3D=3D"") {=0A=
  if (z=3D=3D"-" && _ufns=3D=3D1) { =
c=3D"utmccn=3D(direct)|utmcsr=3D(direct)|utmcmd=3D(none)"; }=0A=
  if (c=3D=3D"-" || c=3D=3D"") return "";=0A=
 }=0A=
 if (z!=3D"-") {=0A=
  i=3Dz.indexOf(".");=0A=
  if (i>-1) i=3Dz.indexOf(".",i+1);=0A=
  if (i>-1) i=3Dz.indexOf(".",i+1);=0A=
  if (i>-1) i=3Dz.indexOf(".",i+1);=0A=
  t=3Dz.substring(i+1,z.length);=0A=
  if (t.toLowerCase()=3D=3Dc.toLowerCase()) cs=3D1;=0A=
  t=3Dz.substring(0,i);=0A=
  if ((i=3Dt.lastIndexOf(".")) > -1) {=0A=
   t=3Dt.substring(i+1,t.length);=0A=
   cn=3D(t*1);=0A=
  }=0A=
 }=0A=
 if (cs=3D=3D0 || _ufns=3D=3D1) {=0A=
  t=3D_uGC(dc,"__utma=3D"+_udh,";");=0A=
  if ((i=3Dt.lastIndexOf(".")) > 9) {=0A=
   _uns=3Dt.substring(i+1,t.length);=0A=
   _uns=3D(_uns*1);=0A=
  }=0A=
  cn++;=0A=
  if (_uns=3D=3D0) _uns=3D1;=0A=
  _ubd.cookie=3D"__utmz=3D"+_udh+"."+_ust+"."+_uns+"."+cn+"."+c+"; =
path=3D"+_utcp+"; "+x+_udo;=0A=
 }=0A=
 if (cs=3D=3D0 || _ufns=3D=3D1) return "&utmcn=3D1";=0A=
 else return "&utmcr=3D1";=0A=
}=0A=
function _uRef() {=0A=
 if (_ur=3D=3D"0" || _ur=3D=3D"" || _ur=3D=3D"-") return "";=0A=
 var i=3D0,h,k,n;=0A=
 if ((i=3D_ur.indexOf("://"))<0) return "";=0A=
 h=3D_ur.substring(i+3,_ur.length);=0A=
 if (h.indexOf("/") > -1) {=0A=
  k=3Dh.substring(h.indexOf("/"),h.length);=0A=
  if (k.indexOf("?") > -1) k=3Dk.substring(0,k.indexOf("?"));=0A=
  h=3Dh.substring(0,h.indexOf("/"));=0A=
 }=0A=
 h=3Dh.toLowerCase();=0A=
 n=3Dh;=0A=
 if ((i=3Dn.indexOf(":")) > -1) n=3Dn.substring(0,i);=0A=
 for (var ii=3D0;ii<_uRno.length;ii++) {=0A=
  if ((i=3Dn.indexOf(_uRno[ii].toLowerCase())) > -1 && =
n.length=3D=3D(i+_uRno[ii].length)) { _ufno=3D1; break; }=0A=
 }=0A=
 if (h.indexOf("www.")=3D=3D0) h=3Dh.substring(4,h.length);=0A=
 return =
"utmccn=3D(referral)|utmcsr=3D"+_uEC(h)+"|"+"utmcct=3D"+_uEC(k)+"|utmcmd=3D=
referral";=0A=
}=0A=
function _uOrg(t) {=0A=
 if (_ur=3D=3D"0" || _ur=3D=3D"" || _ur=3D=3D"-") return "";=0A=
 var i=3D0,h,k;=0A=
 if ((i=3D_ur.indexOf("://")) < 0) return "";=0A=
 h=3D_ur.substring(i+3,_ur.length);=0A=
 if (h.indexOf("/") > -1) {=0A=
  h=3Dh.substring(0,h.indexOf("/"));=0A=
 }=0A=
 for (var ii=3D0;ii<_uOsr.length;ii++) {=0A=
  if (h.toLowerCase().indexOf(_uOsr[ii].toLowerCase()) > -1) {=0A=
   if ((i=3D_ur.indexOf("?"+_uOkw[ii]+"=3D")) > -1 || =
(i=3D_ur.indexOf("&"+_uOkw[ii]+"=3D")) > -1) {=0A=
    k=3D_ur.substring(i+_uOkw[ii].length+2,_ur.length);=0A=
    if ((i=3Dk.indexOf("&")) > -1) k=3Dk.substring(0,i);=0A=
    for (var yy=3D0;yy<_uOno.length;yy++) {=0A=
     if (_uOno[yy].toLowerCase()=3D=3Dk.toLowerCase()) { _ufno=3D1; =
break; }=0A=
    }=0A=
    if (t) return _uEC(k);=0A=
    else return =
"utmccn=3D(organic)|utmcsr=3D"+_uEC(_uOsr[ii])+"|"+"utmctr=3D"+_uEC(k)+"|=
utmcmd=3Dorganic";=0A=
   }=0A=
  }=0A=
 }=0A=
 return "";=0A=
}=0A=
function _uBInfo() {=0A=
 var sr=3D"-",sc=3D"-",ul=3D"-",fl=3D"-",cs=3D"-",je=3D1;=0A=
 var n=3Dnavigator;=0A=
 if (self.screen) {=0A=
  sr=3Dscreen.width+"x"+screen.height;=0A=
  sc=3Dscreen.colorDepth+"-bit";=0A=
 } else if (self.java) {=0A=
  var j=3Djava.awt.Toolkit.getDefaultToolkit();=0A=
  var s=3Dj.getScreenSize();=0A=
  sr=3Ds.width+"x"+s.height;=0A=
 }=0A=
 if (n.language) { ul=3Dn.language.toLowerCase(); }=0A=
 else if (n.browserLanguage) { ul=3Dn.browserLanguage.toLowerCase(); }=0A=
 je=3Dn.javaEnabled()?1:0;=0A=
 if (_uflash) fl=3D_uFlash();=0A=
 if (_ubd.characterSet) cs=3D_uES(_ubd.characterSet);=0A=
 else if (_ubd.charset) cs=3D_uES(_ubd.charset);=0A=
 return =
"&utmcs=3D"+cs+"&utmsr=3D"+sr+"&utmsc=3D"+sc+"&utmul=3D"+ul+"&utmje=3D"+j=
e+"&utmfl=3D"+fl;=0A=
}=0A=
function __utmSetTrans() {=0A=
 var e;=0A=
 if (_ubd.getElementById) e=3D_ubd.getElementById("utmtrans");=0A=
 else if (_ubd.utmform && _ubd.utmform.utmtrans) =
e=3D_ubd.utmform.utmtrans;=0A=
 if (!e) return;=0A=
 var l=3De.value.split("UTM:");=0A=
 var i,i2,c;=0A=
 if (_userv=3D=3D0 || _userv=3D=3D2) i=3Dnew Array();=0A=
 if (_userv=3D=3D1 || _userv=3D=3D2) { i2=3Dnew Array(); c=3D_uGCS(); }=0A=
=0A=
 for (var ii=3D0;ii<l.length;ii++) {=0A=
  l[ii]=3D_uTrim(l[ii]);=0A=
  if (l[ii].charAt(0)!=3D'T' && l[ii].charAt(0)!=3D'I') continue;=0A=
  var r=3DMath.round(Math.random()*2147483647);=0A=
  if (!_utsp || _utsp=3D=3D"") _utsp=3D"|";=0A=
  var f=3Dl[ii].split(_utsp),s=3D"";=0A=
  if (f[0].charAt(0)=3D=3D'T') {=0A=
   s=3D"&utmt=3Dtran"+"&utmn=3D"+r;=0A=
   f[1]=3D_uTrim(f[1]); if(f[1]&&f[1]!=3D"") =
s+=3D"&utmtid=3D"+_uES(f[1]);=0A=
   f[2]=3D_uTrim(f[2]); if(f[2]&&f[2]!=3D"") =
s+=3D"&utmtst=3D"+_uES(f[2]);=0A=
   f[3]=3D_uTrim(f[3]); if(f[3]&&f[3]!=3D"") =
s+=3D"&utmtto=3D"+_uES(f[3]);=0A=
   f[4]=3D_uTrim(f[4]); if(f[4]&&f[4]!=3D"") =
s+=3D"&utmttx=3D"+_uES(f[4]);=0A=
   f[5]=3D_uTrim(f[5]); if(f[5]&&f[5]!=3D"") =
s+=3D"&utmtsp=3D"+_uES(f[5]);=0A=
   f[6]=3D_uTrim(f[6]); if(f[6]&&f[6]!=3D"") =
s+=3D"&utmtci=3D"+_uES(f[6]);=0A=
   f[7]=3D_uTrim(f[7]); if(f[7]&&f[7]!=3D"") =
s+=3D"&utmtrg=3D"+_uES(f[7]);=0A=
   f[8]=3D_uTrim(f[8]); if(f[8]&&f[8]!=3D"") =
s+=3D"&utmtco=3D"+_uES(f[8]);=0A=
  } else {=0A=
   s=3D"&utmt=3Ditem"+"&utmn=3D"+r;=0A=
   f[1]=3D_uTrim(f[1]); if(f[1]&&f[1]!=3D"") =
s+=3D"&utmtid=3D"+_uES(f[1]);=0A=
   f[2]=3D_uTrim(f[2]); if(f[2]&&f[2]!=3D"") =
s+=3D"&utmipc=3D"+_uES(f[2]);=0A=
   f[3]=3D_uTrim(f[3]); if(f[3]&&f[3]!=3D"") =
s+=3D"&utmipn=3D"+_uES(f[3]);=0A=
   f[4]=3D_uTrim(f[4]); if(f[4]&&f[4]!=3D"") =
s+=3D"&utmiva=3D"+_uES(f[4]);=0A=
   f[5]=3D_uTrim(f[5]); if(f[5]&&f[5]!=3D"") =
s+=3D"&utmipr=3D"+_uES(f[5]);=0A=
   f[6]=3D_uTrim(f[6]); if(f[6]&&f[6]!=3D"") =
s+=3D"&utmiqt=3D"+_uES(f[6]);=0A=
  }=0A=
  if ((_userv=3D=3D0 || _userv=3D=3D2) && _uSP()) {=0A=
   i[ii]=3Dnew Image(1,1);=0A=
   i[ii].src=3D_ugifpath+"?"+"utmwv=3D"+_uwv+s;=0A=
   i[ii].onload=3Dfunction() { _uVoid(); }=0A=
  }=0A=
  if ((_userv=3D=3D1 || _userv=3D=3D2) && _uSP()) {=0A=
   i2[ii]=3Dnew Image(1,1);=0A=
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i2[ii].src=3D_ugifpath2+"?"+"utmwv=3D"+_uwv+s+"&utmac=3D"+_uacct+"&utmcc=3D=
"+c;=0A=
   i2[ii].onload=3Dfunction() { _uVoid(); }=0A=
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 return;=0A=
}=0A=
function _uFlash() {=0A=
 var f=3D"-",n=3Dnavigator;=0A=
 if (n.plugins && n.plugins.length) {=0A=
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   if (n.plugins[ii].name.indexOf('Shockwave Flash')!=3D-1) {=0A=
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   }=0A=
  }=0A=
 } else if (window.ActiveXObject) {=0A=
  for (var ii=3D10;ii>=3D2;ii--) {=0A=
   try {=0A=
    var fl=3Deval("new =
ActiveXObject('ShockwaveFlash.ShockwaveFlash."+ii+"');");=0A=
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   catch(e) {}=0A=
  }=0A=
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 return f;=0A=
}=0A=
function __utmLinker(l,h) {=0A=
 if (!_ulink) return;=0A=
 var p,k,a=3D"-",b=3D"-",c=3D"-",x=3D"-",z=3D"-",v=3D"-";=0A=
 var dc=3D_ubd.cookie;=0A=
 if (!l || l=3D=3D"") return;=0A=
 var iq =3D l.indexOf("?"); =0A=
 var ih =3D l.indexOf("#"); =0A=
 if (dc) {=0A=
  a=3D_uES(_uGC(dc,"__utma=3D"+_udh,";"));=0A=
  b=3D_uES(_uGC(dc,"__utmb=3D"+_udh,";"));=0A=
  c=3D_uES(_uGC(dc,"__utmc=3D"+_udh,";"));=0A=
  x=3D_uES(_uGC(dc,"__utmx=3D"+_udh,";"));=0A=
  z=3D_uES(_uGC(dc,"__utmz=3D"+_udh,";"));=0A=
  v=3D_uES(_uGC(dc,"__utmv=3D"+_udh,";"));=0A=
  k=3D(_uHash(a+b+c+x+z+v)*1)+(_udh*1);=0A=
  =
p=3D"__utma=3D"+a+"&__utmb=3D"+b+"&__utmc=3D"+c+"&__utmx=3D"+x+"&__utmz=3D=
"+z+"&__utmv=3D"+v+"&__utmk=3D"+k;=0A=
 }=0A=
 if (p) {=0A=
  if (h && ih>-1) return;=0A=
  if (h) { _udl.href=3Dl+"#"+p; }=0A=
  else {=0A=
   if (iq=3D=3D-1 && ih=3D=3D-1) _udl.href=3Dl+"?"+p;=0A=
   else if (ih=3D=3D-1) _udl.href=3Dl+"&"+p;=0A=
   else if (iq=3D=3D-1) =
_udl.href=3Dl.substring(0,ih-1)+"?"+p+l.substring(ih);=0A=
   else _udl.href=3Dl.substring(0,ih-1)+"&"+p+l.substring(ih);=0A=
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 } else { _udl.href=3Dl; }=0A=
}=0A=
function __utmLinkPost(f,h) {=0A=
 if (!_ulink) return;=0A=
 var p,k,a=3D"-",b=3D"-",c=3D"-",x=3D"-",z=3D"-",v=3D"-";=0A=
 var dc=3D_ubd.cookie;=0A=
 if (!f || !f.action) return;=0A=
 var iq =3D f.action.indexOf("?"); =0A=
 var ih =3D f.action.indexOf("#"); =0A=
 if (dc) {=0A=
  a=3D_uES(_uGC(dc,"__utma=3D"+_udh,";"));=0A=
  b=3D_uES(_uGC(dc,"__utmb=3D"+_udh,";"));=0A=
  c=3D_uES(_uGC(dc,"__utmc=3D"+_udh,";"));=0A=
  x=3D_uES(_uGC(dc,"__utmx=3D"+_udh,";"));=0A=
  z=3D_uES(_uGC(dc,"__utmz=3D"+_udh,";"));=0A=
  v=3D_uES(_uGC(dc,"__utmv=3D"+_udh,";"));=0A=
  k=3D(_uHash(a+b+c+x+z+v)*1)+(_udh*1);=0A=
  =
p=3D"__utma=3D"+a+"&__utmb=3D"+b+"&__utmc=3D"+c+"&__utmx=3D"+x+"&__utmz=3D=
"+z+"&__utmv=3D"+v+"&__utmk=3D"+k;=0A=
 }=0A=
 if (p) {=0A=
  if (h && ih>-1) return;=0A=
  if (h) { f.action+=3D"#"+p; }=0A=
  else {=0A=
   if (iq=3D=3D-1 && ih=3D=3D-1) f.action+=3D"?"+p;=0A=
   else if (ih=3D=3D-1) f.action+=3D"&"+p;=0A=
   else if (iq=3D=3D-1) =
f.action=3Df.action.substring(0,ih-1)+"?"+p+f.action.substring(ih);=0A=
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f.action=3Df.action.substring(0,ih-1)+"&"+p+f.action.substring(ih);=0A=
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 }=0A=
 return;=0A=
}=0A=
function __utmSetVar(v) {=0A=
 if (!v || v=3D=3D"") return;=0A=
 if (!_udo || _udo =3D=3D "") {=0A=
  _udh=3D_uDomain();=0A=
  if (_udn && _udn!=3D"") { _udo=3D" domain=3D"+_udn+";"; }=0A=
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 if (!_uVG()) return;=0A=
 var r=3DMath.round(Math.random() * 2147483647);=0A=
 _ubd.cookie=3D"__utmv=3D"+_udh+"."+_uES(v)+"; path=3D"+_utcp+"; =
expires=3D"+_uNx()+";"+_udo;=0A=
 var s=3D"&utmt=3Dvar&utmn=3D"+r;=0A=
 if ((_userv=3D=3D0 || _userv=3D=3D2) && _uSP()) {=0A=
  var i=3Dnew Image(1,1);=0A=
  i.src=3D_ugifpath+"?"+"utmwv=3D"+_uwv+s;=0A=
  i.onload=3Dfunction() { _uVoid(); }=0A=
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 if ((_userv=3D=3D1 || _userv=3D=3D2) && _uSP()) {=0A=
  var i2=3Dnew Image(1,1);=0A=
  =
i2.src=3D_ugifpath2+"?"+"utmwv=3D"+_uwv+s+"&utmac=3D"+_uacct+"&utmcc=3D"+=
_uGCS();=0A=
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 }=0A=
}=0A=
function _uGCS() {=0A=
 var t,c=3D"",dc=3D_ubd.cookie;=0A=
 if ((t=3D_uGC(dc,"__utma=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utma=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmb=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmb=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmc=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmc=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmx=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmx=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmz=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmz=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmv=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmv=3D"+t+";");=0A=
 if (c.charAt(c.length-1)=3D=3D"+") c=3Dc.substring(0,c.length-1);=0A=
 return c;=0A=
}=0A=
function _uGC(l,n,s) {=0A=
 if (!l || l=3D=3D"" || !n || n=3D=3D"" || !s || s=3D=3D"") return "-";=0A=
 var i,i2,i3,c=3D"-";=0A=
 i=3Dl.indexOf(n);=0A=
 i3=3Dn.indexOf("=3D")+1;=0A=
 if (i > -1) {=0A=
  i2=3Dl.indexOf(s,i); if (i2 < 0) { i2=3Dl.length; }=0A=
  c=3Dl.substring((i+i3),i2);=0A=
 }=0A=
 return c;=0A=
}=0A=
function _uDomain() {=0A=
 if (!_udn || _udn=3D=3D"" || _udn=3D=3D"none") { _udn=3D""; return 1; }=0A=
 if (_udn=3D=3D"auto") {=0A=
  var d=3D_ubd.domain;=0A=
  if (d.substring(0,4)=3D=3D"www.") {=0A=
   d=3Dd.substring(4,d.length);=0A=
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  _udn=3Dd;=0A=
 }=0A=
 _udn =3D _udn.toLowerCase(); =0A=
 if (_uhash=3D=3D"off") return 1;=0A=
 return _uHash(_udn);=0A=
}=0A=
function _uHash(d) {=0A=
 if (!d || d=3D=3D"") return 1;=0A=
 var h=3D0,g=3D0;=0A=
 for (var i=3Dd.length-1;i>=3D0;i--) {=0A=
  var c=3DparseInt(d.charCodeAt(i));=0A=
  h=3D((h << 6) & 0xfffffff) + c + (c << 14);=0A=
  if ((g=3Dh & 0xfe00000)!=3D0) h=3D(h ^ (g >> 21));=0A=
 }=0A=
 return h;=0A=
}=0A=
function _uFixA(c,s,t) {=0A=
 if (!c || c=3D=3D"" || !s || s=3D=3D"" || !t || t=3D=3D"") return "-";=0A=
 var a=3D_uGC(c,"__utma=3D"+_udh,s);=0A=
 var lt=3D0,i=3D0;=0A=
 if ((i=3Da.lastIndexOf(".")) > 9) {=0A=
  _uns=3Da.substring(i+1,a.length);=0A=
  _uns=3D(_uns*1)+1;=0A=
  a=3Da.substring(0,i);=0A=
  if ((i=3Da.lastIndexOf(".")) > 7) {=0A=
   lt=3Da.substring(i+1,a.length);=0A=
   a=3Da.substring(0,i);=0A=
  }=0A=
  if ((i=3Da.lastIndexOf(".")) > 5) {=0A=
   a=3Da.substring(0,i);=0A=
  }=0A=
  a+=3D"."+lt+"."+t+"."+_uns;=0A=
 }=0A=
 return a;=0A=
}=0A=
function _uTrim(s) {=0A=
  if (!s || s=3D=3D"") return "";=0A=
  while ((s.charAt(0)=3D=3D' ') || (s.charAt(0)=3D=3D'\n') || =
(s.charAt(0,1)=3D=3D'\r')) s=3Ds.substring(1,s.length);=0A=
  while ((s.charAt(s.length-1)=3D=3D' ') || =
(s.charAt(s.length-1)=3D=3D'\n') || (s.charAt(s.length-1)=3D=3D'\r')) =
s=3Ds.substring(0,s.length-1);=0A=
  return s;=0A=
}=0A=
function _uEC(s) {=0A=
  var n=3D"";=0A=
  if (!s || s=3D=3D"") return "";=0A=
  for (var i=3D0;i<s.length;i++) {if (s.charAt(i)=3D=3D" ") n+=3D"+"; =
else n+=3Ds.charAt(i);}=0A=
  return n;=0A=
}=0A=
function __utmVisitorCode(f) {=0A=
 var r=3D0,t=3D0,i=3D0,i2=3D0,m=3D31;=0A=
 var a=3D_uGC(_ubd.cookie,"__utma=3D"+_udh,";");=0A=
 if ((i=3Da.indexOf(".",0))<0) return;=0A=
 if ((i2=3Da.indexOf(".",i+1))>0) r=3Da.substring(i+1,i2); else return =
"";  =0A=
 if ((i=3Da.indexOf(".",i2+1))>0) t=3Da.substring(i2+1,i); else return =
"";  =0A=
 if (f) {=0A=
  return r;=0A=
 } else {=0A=
  var c=3Dnew =
Array('A','B','C','D','E','F','G','H','J','K','L','M','N','P','R','S','T'=
,'U','V','W','X','Y','Z','1','2','3','4','5','6','7','8','9');=0A=
  return =
c[r>>28&m]+c[r>>23&m]+c[r>>18&m]+c[r>>13&m]+"-"+c[r>>8&m]+c[r>>3&m]+c[((r=
&7)<<2)+(t>>30&3)]+c[t>>25&m]+c[t>>20&m]+"-"+c[t>>15&m]+c[t>>10&m]+c[t>>5=
&m]+c[t&m];=0A=
 }=0A=
}=0A=
function _uIN(n) {=0A=
 if (!n) return false;=0A=
 for (var i=3D0;i<n.length;i++) {=0A=
  var c=3Dn.charAt(i);=0A=
  if ((c<"0" || c>"9") && (c!=3D".")) return false;=0A=
 }=0A=
 return true;=0A=
}=0A=
function _uES(s,u) {=0A=
 if (typeof(encodeURIComponent) =3D=3D 'function') {=0A=
  if (u) return encodeURI(s);=0A=
  else return encodeURIComponent(s);=0A=
 } else {=0A=
  return escape(s);=0A=
 }=0A=
}=0A=
function _uUES(s) {=0A=
 if (typeof(decodeURIComponent) =3D=3D 'function') {=0A=
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 } else {=0A=
  return unescape(s);=0A=
 }=0A=
}=0A=
function _uVG() {=0A=
 if((_udn.indexOf("www.google.") =3D=3D 0 || _udn.indexOf(".google.") =
=3D=3D 0 || _udn.indexOf("google.") =3D=3D 0) && _utcp=3D=3D'/' && =
_udn.indexOf("google.org")=3D=3D-1) {=0A=
  return false;=0A=
 }=0A=
 return true;=0A=
}=0A=
function _uSP() {=0A=
 var s=3D100;=0A=
 if (_usample) s=3D_usample;=0A=
 if(s>=3D100 || s<=3D0) return true;=0A=
 return ((__utmVisitorCode(1)%10000)<(s*100));=0A=
}=0A=
function urchinPathCopy(p){=0A=
 var d=3Ddocument,nx,tx,sx,i,c,cs,t,h,o;=0A=
 cs=3Dnew Array("a","b","c","v","x","z");=0A=
 h=3D_uDomain(); if (_udn && _udn!=3D"") o=3D" domain=3D"+_udn+";";=0A=
 nx=3D_uNx()+";";=0A=
 tx=3Dnew Date(); tx.setTime(tx.getTime()+(_utimeout*1000));=0A=
 tx=3Dtx.toGMTString()+";";=0A=
 sx=3Dnew Date(); sx.setTime(sx.getTime()+(_ucto*1000));=0A=
 sx=3Dsx.toGMTString()+";";=0A=
 for (i=3D0;i<6;i++){=0A=
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  if (i=3D=3D1) t+=3Dtx; else if (i=3D=3D2) t=3D""; else if (i=3D=3D5) =
t+=3Dsx; else t+=3Dnx;=0A=
  c=3D_uGC(d.cookie,"__utm"+cs[i]+"=3D"+h,";");=0A=
  if (c!=3D"-") d.cookie=3D"__utm"+cs[i]+"=3D"+c+"; path=3D"+p+";"+t+o;=0A=
 }=0A=
}=0A=
function _uCO() {=0A=
 if (!_utk || _utk=3D=3D"" || _utk.length<10) return;=0A=
 var d=3D'www.google.com';=0A=
 if (_utk.charAt(0)=3D=3D'!') d=3D'analytics.corp.google.com';=0A=
 _ubd.cookie=3D"GASO=3D"+_utk+"; path=3D"+_utcp+";"+_udo;=0A=
 var sc=3Ddocument.createElement('script');=0A=
 sc.type=3D'text/javascript';=0A=
 sc.id=3D"_gasojs";=0A=
 =
sc.src=3D'https://'+d+'/analytics/reporting/overlay_js?gaso=3D'+_utk+'&'+=
Math.random();=0A=
 document.getElementsByTagName('head')[0].appendChild(sc);  =0A=
}=0A=
function _uGT() {=0A=
 var h=3Dlocation.hash, a;=0A=
 if (h && h!=3D"" && h.indexOf("#gaso=3D")=3D=3D0) {=0A=
  a=3D_uGC(h,"gaso=3D","&");=0A=
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  a=3D_uGC(_ubd.cookie,"GASO=3D",";");=0A=
 }=0A=
 return a;=0A=
}=0A=
var _utk=3D_uGT();=0A=
if (_utk && _utk!=3D"" && _utk.length>10) {=0A=
 if (window.addEventListener) {=0A=
  window.addEventListener('load', _uCO, false); =0A=
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  window.attachEvent('onload', _uCO);=0A=
 }=0A=
}=0A=
=0A=
function _uNx() {=0A=
  return (new Date((new Date()).getTime()+63072000000)).toGMTString();=0A=
}=0A=

------=_NextPart_000_0000_01C85938.DD0370D0--

