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Subject: Expression of oligodendrocyte progenitor cell antigens by gliomas: Implications for the histogenesis of brain tumors -- Shoshan et al. 96 (18): 10361 -- Proceedings of the National Academy of Sciences
Date: Wed, 16 Jan 2008 19:20:49 +0100
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<P><FONT size=3D-1>Vol. 96, Issue 18, 10361-10366, August 31, =
1999</FONT><BR>
<H2><FONT color=3D#a70716 size=3D-1>Medical =
Sciences<BR></FONT>Expression of=20
oligodendrocyte progenitor cell antigens by gliomas: Implications for =
the=20
histogenesis of brain tumors </H2><STRONG><NOWRAP>Yigal=20
Shoshan<SUP>*</SUP><SUP>,</SUP><SUP><IMG alt=3D"dagger "=20
src=3D"http://www.pnas.org/math/12pt/normal/scr/dagger.gif"=20
align=3Dbaseline></SUP><SUP>,</SUP><A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#FN152"><SUP><IMG=
=20
alt=3D"Dagger " =
src=3D"http://www.pnas.org/math/12pt/normal/scr/link/Dagger.gif"=20
align=3Dbaseline border=3D0></SUP></A>,<WBR> Akiko=20
Nishiyama<SUP>*</SUP><SUP>,</SUP><A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#FN153"><SUP>=A7<=
/SUP></A>,<WBR>=20
Ansi Chang<SUP>*</SUP>,<WBR> Sverre M=F6rk<SUP>*</SUP>,<WBR> Gene H.=20
Barnett<SUP><IMG alt=3D"dagger "=20
src=3D"http://www.pnas.org/math/12pt/normal/scr/dagger.gif"=20
align=3Dbaseline></SUP>,<WBR> John K. =
Cowell<SUP>*</SUP><SUP>,</SUP><SUP><IMG=20
alt=3D"dagger " =
src=3D"http://www.pnas.org/math/12pt/normal/scr/dagger.gif"=20
align=3Dbaseline></SUP>,<WBR> Bruce D. Trapp<SUP>*</SUP>, and<WBR> Susan =
M.=20
Staugaitis<SUP>*</SUP><SUP>,</SUP><SUP><IMG alt=3D"dagger "=20
src=3D"http://www.pnas.org/math/12pt/normal/scr/dagger.gif"=20
align=3Dbaseline></SUP><SUP>,</SUP><A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#FN154"><SUP>=B6<=
/SUP></A>=20
</NOWRAP></STRONG>
<P><SUP>*</SUP>&nbsp;Department of Neurosciences,<NOCOMMA> The Lerner =
Research=20
Institute, and <SUP><IMG alt=3D"dagger "=20
src=3D"http://www.pnas.org/math/12pt/normal/scr/dagger.gif"=20
align=3Dbaseline></SUP>&nbsp;Department of Neurosurgery, Cleveland =
Clinic=20
Foundation, Cleveland, OH 44195=20
<P>Communicated by George R.&nbsp;Stark, Cleveland Clinic Foundation, =
Cleveland,=20
OH, June 29,&nbsp;1999 (received for review March&nbsp;8,&nbsp;1999) =
</P><A=20
name=3Dabs><!-- comment for mosaic --></A><BR clear=3Dall><A =
name=3DAbstract><!-- null --></A>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff>&nbsp;<IMG=20
      height=3D21 alt=3D"" hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT=20
      size=3D+2>&nbsp;&nbsp;ABSTRACT</FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1 NOWRAP><R>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#Top"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>TOP</A> <BR><IMG height=3D9 hspace=3D5=20
      src=3D"http://www.pnas.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>ABSTRACT</FONT> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#Introduction"><I=
MG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>INTRODUCTION</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#SEC1"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>MATERIALS AND METHODS</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#SEC2"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>RESULTS</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#SEC3"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>DISCUSSION</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#References"><IMG=
=20
      height=3D9 hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>REFERENCES</A> </FONT></TH></TR></TBODY></TABLE>
<P>The early events in neoplastic transformation can be understood only =
by=20
comparison of the neoplastic cell with its nontransformed<SUP>=20
</SUP>counterpart. The most common central nervous system gliomas=20
traditionally<SUP> </SUP>are thought to arise from mature astrocytes and =

oligodendrocytes.<SUP> </SUP>We examined the possibility that gliomas =
arise from=20
a population<SUP> </SUP>of glia that has properties of oligodendrocyte=20
progenitors. These<SUP> </SUP>glial cells express the NG2 chondroitin =
sulfate=20
proteoglycan and<SUP> </SUP>the <IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>&nbsp;receptor of platelet-derived growth factor <I>in =
vivo</I>.=20
We identified<SUP> </SUP>NG2 and the <IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>&nbsp;receptor of platelet-derived growth factor =
expression<SUP>=20
</SUP>in tissue from seven of seven oligodendrogliomas, three of =
three<SUP>=20
</SUP>pilocytic astrocytomas, and one of five glioblastoma =
multiforme.<SUP>=20
</SUP>These data provide evidence that glial tumors arise from =
glial<SUP>=20
</SUP>progenitor cells. Molecules expressed by these progenitor =
cells<SUP>=20
</SUP>should be considered as targets for novel<SUP> </SUP>therapeutics. =

</P><TXT><A name=3DSEC0><!-- comment for mosaic --></A><BR =
clear=3Dall><A=20
name=3DIntroduction><!-- null --></A>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff>&nbsp;<IMG=20
      height=3D21 alt=3D"" hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT=20
      =
size=3D+2>&nbsp;&nbsp;INTRODUCTION</FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1 NOWRAP><R>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#Top"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>TOP</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#Abstract"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>ABSTRACT</A> <BR><IMG height=3D9 hspace=3D5=20
      src=3D"http://www.pnas.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>INTRODUCTION</FONT> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#SEC1"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>MATERIALS AND METHODS</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#SEC2"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>RESULTS</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#SEC3"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>DISCUSSION</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#References"><IMG=
=20
      height=3D9 hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>REFERENCES</A> </FONT></TH></TR></TBODY></TABLE>
<P>In 1926,&nbsp;Bailey and Cushing classified glial neoplasms on the =
basis of=20
the morphological similarities of the tumor cells to<SUP> =
</SUP>nonneoplastic=20
cells (<A =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B1">1</A>).=20
Although the classification and nomenclature<SUP> </SUP>have evolved =
over the=20
years, this general principle is still applied.<SUP> </SUP>The most =
common=20
gliomas, astrocytoma [including glioblastoma multiforme<SUP> =
</SUP>(GBM)] and=20
oligodendroglioma (OLIGO), are defined as being composed<SUP> </SUP>of=20
neoplastic astrocytes and oligodendrocytes, respectively (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B2">2</A>,<SUP> =
</SUP><A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B3">3</A>). The =

implication of such definitions is that these neoplasms<SUP> =
</SUP>originate=20
from mature cell types. The alternative possibility,<SUP> </SUP>that =
gliomas=20
arise from a dividing progenitor cell, has been raised<SUP> </SUP>on =
numerous=20
occasions (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B4">4-12</A>); =
however,=20
the testing of this hypothesis<SUP> </SUP>has been limited by the lack =
of=20
phenotypic markers that identify<SUP> </SUP>specific progenitor cell =
populations=20
in tissue<SUP> </SUP>sections. </P>
<P>One progenitor that has attracted much interest is the O-2A =
progenitor (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B13">13</A>). =
<I>In=20
vitro</I> studies have shown that this cell<SUP> </SUP>is responsive to =
the=20
platelet-derived growth factor (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B14">14-16</A>) =

because<SUP> </SUP>of its expression of the <IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>&nbsp;receptor (PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif" =
align=3Dbaseline>-R) (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B17">17</A>). =
O-2A=20
progenitors<SUP> </SUP>also express the NG2 chondroitin sulfate =
proteoglycan (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B18">18-20</A>).=
<SUP>=20
</SUP>Both NG2 and PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif" =
align=3Dbaseline>-R can be=20
detected reliably in tissue sections<SUP> </SUP>(<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B18">18</A>). =
Although=20
these antigens are expressed on a variety of<SUP> =
</SUP>nonneuroectodermal cells=20
(<A =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B21">21-23</A>),=
 glia=20
that coexpress these antigens<SUP> </SUP>represent a unique cell =
population.=20
These cells are abundant throughout<SUP> </SUP>the neuroaxis (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B18">18</A>, <A =

href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B24">24</A>, <A =

href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B25">25</A>) =
and show=20
evidence of DNA synthesis<SUP> </SUP>even in adulthood (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B24">24</A>). =
NG2 is not=20
expressed by mature oligodendrocytes,<SUP> </SUP>astrocytes, or =
microglia (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B18">18</A>, <A =

href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B26">26</A>). =
Some=20
NG2<SUP>+</SUP> cells also express oligodendrocyte markers in a spatial =
and=20
temporal<SUP> </SUP>pattern that closely precedes myelination, =
indicating that=20
these<SUP> </SUP>cells are oligodendrocyte progenitors (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B24">24</A>, <A =

href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B27">27</A>); =
however,=20
NG2<SUP>+</SUP> cells may have additional functions (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B20">20</A>).=20
NG2<SUP>+</SUP> glia recently have been demonstrated in adult human =
brain=20
tissue<SUP> </SUP>sections (see <I>Results</I>). In pathological =
conditions such=20
as multiple<SUP> </SUP>sclerosis, individual cells are stained more =
intensely by=20
NG2<SUP> </SUP>and PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif" =
align=3Dbaseline>-R than=20
cells in normal adult brain (A.C. and B.D.T.,<SUP> =
</SUP>unpublished<SUP>=20
</SUP>observation). </P>
<P>The response of different gliomas to therapy shows a correlation with =
cell=20
lineage. For example, patients with anaplastic<SUP> =
</SUP>oligodendroglioma=20
(AOLIGO) have a higher response rate to chemotherapy<SUP> </SUP>(<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B28">28</A>) =
than do=20
patients with tumors thought to be derived from<SUP> </SUP>astrocytes. =
Most=20
recently, this chemoresponsiveness has been correlated<SUP> </SUP>with =
specific=20
genetic changes (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B29">29</A>). =
These=20
observations warrant<SUP> </SUP>renewed investigation into the cellular =
origin=20
of various glial<SUP> </SUP>tumors by using these more recently =
characterized=20
cell lineage<SUP> </SUP>markers. In the present study we have used=20
immunohistochemistry<SUP> </SUP>and immunoblotting to detect NG2 and =
PDGF<IMG=20
alt=3D"alpha " src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R in OLIGO and different<SUP> </SUP>types of<SUP>=20
</SUP>astrocytoma. </P><BR clear=3Dall><A name=3DSEC1><!-- null --></A>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff>&nbsp;<IMG=20
      height=3D21 alt=3D"" hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT=20
      size=3D+2>&nbsp;&nbsp;MATERIALS AND =
METHODS</FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1 NOWRAP><R>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#Top"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>TOP</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#Abstract"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>ABSTRACT</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#Introduction"><I=
MG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>INTRODUCTION</A> <BR><IMG height=3D9 hspace=3D5=20
      src=3D"http://www.pnas.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>MATERIALS AND METHODS</FONT> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#SEC2"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>RESULTS</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#SEC3"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>DISCUSSION</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#References"><IMG=
=20
      height=3D9 hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>REFERENCES</A> </FONT></TH></TR></TBODY></TABLE>
<P align=3Dleft><B>Antibodies.</B> Antibodies from the following sources =
were=20
used: monoclonal anti-human melanoma-associated chondroitin sulfate=20
proteoglycan<SUP> </SUP>[mAb 9.2.27,&nbsp;1:2,000; R.&nbsp;Reisfeld, =
Scripps=20
Research Institute,<SUP> </SUP>La Jolla, CA, (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B30">30</A>, <A =

href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B31">31</A>)]; =
rabbit=20
553&nbsp;anti-rat NG2 antibody<SUP> </SUP>(1:2,000; =
W.&nbsp;B.&nbsp;Stallcup,=20
Burnham Institute, La Jolla, CA); rabbit<SUP> </SUP>anti-human PDGF<IMG=20
alt=3D"alpha " src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R [R7, 1:2,000; C.-H. Heldin, Ludwig Institute,<SUP>=20
</SUP>Uppsala, Sweden (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B32">32</A>)]; =
rabbit=20
anti-glial fibrillary acidic protein<SUP> </SUP>(GFAP, 1:5,000, Dako);=20
monoclonal anti-GFAP (1:2,500, Dako); monoclonal<SUP> </SUP>anti-myelin =
basic=20
protein (MBP, 1:2,000; Dako); and leukocyte<SUP> </SUP>common antigen =
(LCA,=20
1:40;<SUP> </SUP>Dako). </P>
<P align=3Dleft><B>Tissue Processing.</B> Brain tumor samples were =
obtained by=20
biopsy from 16&nbsp;patients. These studies were approved by the =
Institutional=20
Review Board<SUP> </SUP>of the Cleveland Clinic Foundation, and the =
specimens=20
were obtained<SUP> </SUP>after representative sampling for diagnostic =
purposes.=20
Original<SUP> </SUP>slides were reviewed by two neuropathologists =
(S.M.S. and=20
S.M.).<SUP> </SUP>The diagnoses were: four OLIGO, three AOLIGO, three=20
pilocytic<SUP> </SUP>astrocytoma (PA), one fibrillary astrocytoma (A), =
and five=20
GBM.<SUP> </SUP>The tissues collected were snap-frozen in liquid =
nitrogen=20
and<SUP> </SUP>stored at <IMG alt=3D-=20
src=3D"http://www.pnas.org/math/12pt/normal/minus.gif" =
align=3Dbaseline>70=B0C.=20
Portions of five of the tumors were fixed immediately<SUP> </SUP>in 4%=20
paraformaldehyde at 4=B0C overnight and cryoprotected in =
0.1<SUP>&nbsp;</SUP>M=20
phosphate buffer, pH 7.6,&nbsp;containing 20% glycerol at 4=B0C =
until<SUP>=20
</SUP>used for sectioning (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B27">27</A>). =
</P>
<P align=3Dleft><B>Histochemical Studies.</B> Unfixed, frozen samples =
were thawed=20
in 4% paraformaldehyde overnight at 4=B0C and cryoprotected. Sections =
(30&nbsp;=B5m=20
thick) were<SUP> </SUP>obtained by using a sliding microtome (Leica SM =
2000R)=20
and maintained<SUP> </SUP>in cryostorage solution (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B27">27</A>). =
Sections=20
adjacent to those used<SUP> </SUP>for immunostaining were dried onto =
slides at=20
50=B0C for 30&nbsp;min,<SUP> </SUP>stained with hematoxylin/eosin, and =
compared=20
with the sections<SUP> </SUP>used for diagnosis. Only those samples that =

contained tumor were<SUP> </SUP>included in the study. One AOLIGO (no. =
10), one=20
GBM (no. 4), and<SUP> </SUP>the A (no. 24) consisted of gray matter =
infiltrated=20
by variable<SUP> </SUP>numbers of neoplastic cells. One specimen from a =
GBM (no.=20
57)<SUP> </SUP>showed low-grade histology only. The high-grade areas of =
the=20
AOLIGO<SUP> </SUP>were focal in the paraffin sections and could not =
readily be=20
identified<SUP> </SUP>in the specimens used in our<SUP> </SUP>studies. =
</P>
<P align=3Dleft><B>Immunohistochemistry.</B> Sections were rinsed in PBS =
and=20
treated with 10% Triton X-100 and 3% H<SUB>2</SUB>O<SUB>2</SUB> for =
30&nbsp;min=20
at room temperature. Sections were stained by the avidin-biotin complex=20
procedure as described previously (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B27">27</A>). =
Tissue=20
sections were incubated overnight at 4=B0C in primary antibody diluted =
in PBS=20
containing 3% normal goat serum. Diluent without primary antibody served =
as a=20
negative control. Sections were photographed by using an Axiophot =
microscope=20
(Zeiss).<B></B> Five OLIGO were analyzed further by =
double-immunofluorescence=20
labeling. The antibody combinations examined were: NG2 and PDGF<IMG =
alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif" =
align=3Dbaseline>-R,<SUP>=20
</SUP>GFAP, or LCA and PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif" =
align=3Dbaseline>-R and GFAP.=20
Sections were processed as<SUP> </SUP>described above, and the primary=20
antibodies were applied to the<SUP> </SUP>sections simultaneously for =
1-5 days.=20
Sections were incubated<SUP> </SUP>with a mixture of biotinylated =
anti-mouse=20
(1:500; Vector Laboratories)<SUP> </SUP>and fluorescein-conjugated =
anti-rabbit=20
antibody (1:500; Jackson<SUP> </SUP>ImmunoResearch) for 2&nbsp;hr at =
room=20
temperature, followed by incubation<SUP> </SUP>in Texas red-conjugated =
avidin D=20
(1:500; Vector Laboratories)<SUP> </SUP>for 1&nbsp;hr at room =
temperature. For=20
NG2 and LCA double-labeling,<SUP> </SUP>biotinylated anti-mouse IgG2a =
and=20
fluorescein-conjugated anti-mouse<SUP> </SUP>IgG1 (Southern =
Biotechnology=20
Associates) were used. Sections were<SUP> </SUP>rinsed, mounted in =
Vectashield=20
(Vector Laboratories), and analyzed<SUP> </SUP>by confocal microscopy=20
(Aristoplan;<SUP> </SUP>Leica). </P>
<P align=3Dleft><B>Immunoprecipitations and Western Blots.</B> Cultured =
cells and=20
frozen tissues were used for biochemical studies. MG63 human =
osteosarcoma cells=20
and B49 rat glioma cells<SUP> </SUP>express NG2, whereas U251MG human =
glioma=20
cells do not express<SUP> </SUP>NG2 (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B19">19</A>). =
To verify=20
the presence of tumor tissue, frozen samples<SUP> </SUP>(<IMG =
alt=3D"approx "=20
src=3D"http://www.pnas.org/math/12pt/normal/ap.gif" align=3Dbaseline>1=20
cm<SUP>3</SUP>) were sectioned on a cryostat (Leica) along their =
peripheral<SUP>=20
</SUP>surfaces and stained with hematoxylin/eosin. Extracts from =
the<SUP>=20
</SUP>occipital cortex of an epileptic patient and normal gray and =
white<SUP>=20
</SUP>matter from a multiple sclerosis patient were used as =
nontumor<SUP>=20
</SUP>controls. Cells and tissues were lysed in 50&nbsp;mM Tris=B7HCl, =
pH=20
8/150<SUP> </SUP>mM NaCl/1% NP40/1 mM PMSF/10 =B5g/ml leupeptin/2 =
=B5g/ml=20
aprotinin<SUP> </SUP>for 30&nbsp;min at room temperature. To remove=20
glycosaminoglycan chains<SUP> </SUP>from NG2, 0.1&nbsp;unit/ml =
chondroitinase=20
ABC (EC 4.2.2.4; ICN) was<SUP> </SUP>added during the extraction. For=20
immunoprecipitation, chondroitinase-treated<SUP> </SUP>extracts were=20
precipitated with mAb 9.2.27&nbsp;by using protein A-Sepharose.<SUP> =
</SUP>Total=20
extracts and immunoprecipitates were resolved on 4-12% =
polyacrylamide<SUP>=20
</SUP>gradient gels under reducing conditions. Equal amounts of =
protein<SUP>=20
</SUP>from tissue extracts, as determined by the Lowry method, were<SUP> =

</SUP>loaded in each well. After electrophoresis, proteins were =
transferred<SUP>=20
</SUP>to PVDF Immobilon membranes (Millipore, MA) in a buffer =
containing<SUP>=20
</SUP>25&nbsp;mM Tris=B7HCl, 192&nbsp;mM glycine, and 10% methanol. The=20
membranes<SUP> </SUP>were blocked for 2&nbsp;hr at room temperature in =
5% nonfat=20
dry milk<SUP> </SUP>in PBS and then incubated with the rabbit =
553&nbsp;anti-rat=20
NG2 antibody<SUP> </SUP>(1:2,000) or R7 anti-human PDGF<IMG alt=3D"alpha =
"=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif" =
align=3Dbaseline>-R antibody=20
(1:1,000) diluted<SUP> </SUP>in blocking solution at 4=B0C overnight. =
After four=20
washes, the<SUP> </SUP>membranes were incubated with horseradish=20
peroxidase-labeled goat<SUP> </SUP>anti-rabbit immunoglobulins =
(1:10,000;=20
Bio-Rad). Labeled bands<SUP> </SUP>were visualized by using ECL =
detection=20
reagents<SUP> </SUP>(Amersham). </P><BR clear=3Dall><A name=3DSEC2><!-- =
null --></A>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff>&nbsp;<IMG=20
      height=3D21 alt=3D"" hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT=20
      size=3D+2>&nbsp;&nbsp;RESULTS</FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1 NOWRAP><R>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#Top"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>TOP</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#Abstract"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>ABSTRACT</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#Introduction"><I=
MG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>INTRODUCTION</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#SEC1"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>MATERIALS AND METHODS</A> <BR><IMG height=3D9 =
hspace=3D5=20
      src=3D"http://www.pnas.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>RESULTS</FONT> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#SEC3"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>DISCUSSION</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#References"><IMG=
=20
      height=3D9 hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>REFERENCES</A> </FONT></TH></TR></TBODY></TABLE>
<P align=3Dleft><B>Characterization of NG2 Antibodies.</B> The mAb=20
9.2.27&nbsp;recognizes the core protein of a proteoglycan originally=20
characterized in malignant melanoma (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B30">30</A>). =
The=20
amino<SUP> </SUP>acid sequence of this proteoglycan has 84% identity =
with=20
that<SUP> </SUP>of rat NG2 and is considered to be the human homologue =
of=20
NG2<SUP> </SUP>(<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B33">33</A>, <A =

href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B34">34</A>). =
Because mAb=20
9.2.27&nbsp;does not recognize denatured<SUP> </SUP>NG2, the =
553&nbsp;rabbit=20
anti-rat NG2 antibody was used for Western<SUP> </SUP>blots. To =
demonstrate that=20
these two antibodies recognize the<SUP> </SUP>same molecule, the=20
553&nbsp;antibody was used to probe a Western blot<SUP> </SUP>containing =

immunoprecipitates from MG63 cells that had been formed<SUP> </SUP>with =
mAb=20
9.2.27.&nbsp;As shown in Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F1">1</A><I>a</I=
>, lane=20
5,&nbsp;mAb 9.2.27&nbsp;precipitated<SUP> </SUP>a 300-kDa species that =
was=20
detected by the 553&nbsp;antibody and had<SUP> </SUP>the same =
electrophoretic=20
mobility as the NG2 core protein in total<SUP> </SUP>extracts from MG63 =
(lane 4)=20
and B49 cells (lanes 2&nbsp;and 3). The<SUP> </SUP>U251MG cell line, =
which does=20
not express NG2, was used as a negative<SUP> </SUP>control. <A =
name=3DF1><!-- FIG 1 --></A>
<P><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%" border=3D1>
  <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://www.pnas.org/cgi/content/full/96/18/10361/F1"><IMG=20
            height=3D114 hspace=3D10=20
            =
src=3D"http://www.pnas.org/content/vol96/issue18/images/small/pq179272000=
1.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (90K): <BR><NOBR><A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361/F1">[in this=20
            window]</A> <BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F1', 590, 450); =
this.href=3D'/cgi/content-nw/full/96/18/10361/F1'"=20
            =
href=3D"http://www.pnas.org/cgi/content-nw/full/96/18/10361/F1"=20
            target=3DF1>[in a new window]</A><BR>&nbsp; </NOBR></TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG>Fig. 1. &nbsp;</STRONG> =
(<I>a</I>)=20
            mAb 9.2.27&nbsp;and rabbit 553&nbsp;anti-rat NG2 antibodies=20
            recognize the same NG2 core protein. Extracts from human =
U251MG,=20
            MG63 and rat B49 cells lines before (<IMG alt=3D-=20
            src=3D"http://www.pnas.org/math/12pt/normal/minus.gif"=20
            align=3Dbaseline>) and after (+) chondroitinase ABC (ch) =
treatment=20
            were subjected to Western blot by using the rabbit =
553&nbsp;anti-rat=20
            NG2 antibody. Lane 5&nbsp;shows immunoprecipitates from MG63 =
cells=20
            that were formed with mAb 9.2.27.&nbsp;(<I>b</I>) mAb=20
            9.2.27&nbsp;recognizes complex process-bearing cells in =
human=20
            cerebral cortex resected for intractable epilepsy. =
(<I>c-f</I>)=20
            OLIGO express NG2 and PDGF<IMG alt=3D"alpha "=20
            src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
            align=3Dbaseline>-R. At low magnification, NG2 =
immunostaining=20
            (<I>c</I>) demarcates a hypercellular neoplastic area. High=20
            magnification of hematoxylin/eosin-stained tissue (<I>d</I>) =

            demonstrates densely packed round cells typical of OLIGO. =
The=20
            majority of neoplastic cells show a membrane-labeling =
pattern with=20
            NG2 (<I>e</I>) and PDGF<IMG alt=3D"alpha "=20
            src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
            align=3Dbaseline>-R<SUP>+</SUP> (<I>f</I>) antibodies. Tumor =

            30.&nbsp;[Bar&nbsp;=3D&nbsp;35&nbsp;=B5m (<I>b</I>), =
120&nbsp;=B5m=20
            (<I>c</I>), and 50&nbsp;=B5m (<I>d</I>-<I>f</I>).] <BR=20
        =
clear=3Dleft></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER=
><!-- /FIG 1 -->
<P></P>
<P align=3Dleft><B>NG2 Proteoglycan and PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif" =
align=3Dbaseline><I>-</I>R=20
Immunohistochemistry.</B> NG2<SUP>+</SUP> cells are not detectable in =
normal=20
human brain under the conditions that routinely demonstrate NG2 =
immunoreactivity=20
in gliomas. Prolonged incubations of normal tissues with increased =
antibody=20
concentrations reveals an abundant population of process-bearing cells =
in both=20
gray and white matter (Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F1">1</A><I>b</I=
>). The=20
cytoplasmic morphology of these cells is identical to that observed in =
rodent=20
NG2<SUP>+</SUP> cells (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B18">18</A>), =
and they=20
are morphologically and immunohistochemically distinct from human =
astrocytes and=20
microglia (A.C. and B.D.T., unpublished results; see also Figs. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F2">2</A> and =
<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F3">3</A>).<B></=
B> All=20
OLIGO and PA demonstrated intense NG2 immunoreactivity on neoplastic =
cells=20
(Table <A =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#T1">1</A>).=20
This is best illustrated in sections<SUP> </SUP>representing the =
interface=20
between neoplastic foci and normal-appearing<SUP> </SUP>tissue (Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F1">1</A><I>c</I=
>). The=20
neoplastic cells of OLIGO are small and<SUP> </SUP>round by routine =
histology=20
(Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F1">1</A><I>d</I=
>). Cells=20
with the same morphology<SUP> </SUP>show predominantly cell-surface =
staining=20
with antibodies to NG2<SUP> </SUP>and PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif" =
align=3Dbaseline><I>-</I>R=20
(Fig. <A =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F1">1</A>=20
<I>e</I> and <I>f</I>). In sections in which the tumor mass<SUP> =
</SUP>was=20
adjacent to infiltrated brain parenchyma, neoplastic cells<SUP> =
</SUP>showed a=20
few short, thin processes. In tumor 10,&nbsp;which contained<SUP> =
</SUP>only=20
infiltrated gray matter, scattered NG2<SUP>+</SUP> cells with short =
processes=20
were observed. The morphology of these<SUP> </SUP>cells was distinct =
from=20
resident NG2<SUP>+</SUP> cells in normal brain (Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F1">1</A><I>b</I=
>) and=20
also from that observed in<SUP> </SUP>MS lesions and at the edge of =
high-grade=20
neoplasms composed of<SUP> </SUP>NG2<SUP><IMG alt=3D-=20
src=3D"http://www.pnas.org/math/12pt/normal/scr/minus.gif" =
align=3Dbaseline></SUP>=20
cells (data not shown). In PA, intense membrane staining was<SUP> =
</SUP>seen in=20
the microcystic areas of the tumor. More diffuse NG2 =
immunoreactivity<SUP>=20
</SUP>was seen in the compact bipolar areas of the tumor. One GBM =
(no.<SUP>=20
</SUP>54) showed numerous NG2<SUP>+</SUP> tumor cells; the other GBM and =
the A=20
showed no NG2 immunoreactivity.<SUP> </SUP>NG2 immunoreactivity was seen =
in=20
capillaries of many of the tumors<SUP> </SUP>irrespective of diagnosis =
(Table <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#T1">1</A>). =
Capillary=20
staining was seen<SUP> </SUP>only in regions containing tumor. Tumors =
with=20
NG2<SUP>+</SUP> capillaries also contained areas with NG2<SUP><IMG =
alt=3D-=20
src=3D"http://www.pnas.org/math/12pt/normal/scr/minus.gif" =
align=3Dbaseline></SUP>=20
capillaries. <A name=3DF2><!-- FIG 2 --></A>
<P><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%" border=3D1>
  <TBODY>
  <TR bgColor=3D#e1e1e1>
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      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361/F2"><IMG=20
            height=3D145 hspace=3D10=20
            =
src=3D"http://www.pnas.org/content/vol96/issue18/images/small/pq179272000=
2.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (94K): <BR><NOBR><A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361/F2">[in this=20
            window]</A> <BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F2', 590, 519); =
this.href=3D'/cgi/content-nw/full/96/18/10361/F2'"=20
            =
href=3D"http://www.pnas.org/cgi/content-nw/full/96/18/10361/F2"=20
            target=3DF2>[in a new window]</A><BR>&nbsp; </NOBR></TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG>Fig. 2. &nbsp;</STRONG> =
OLIGO=20
            cells coexpress NG2 and PDGF<IMG alt=3D"alpha "=20
            src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
            align=3Dbaseline>-R but not GFAP or LCA. (<I>a</I>-<I>c</I>) =
Sections=20
            from an OLIGO double-labeled with antibodies to PDGF<IMG=20
            alt=3D"alpha " =
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
            align=3Dbaseline>-R (<I>a</I>, green) and NG2 (<I>b</I>, =
red). Merged=20
            images demonstrate colocalization of NG2 and PDGF<IMG =
alt=3D"alpha "=20
            src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
            align=3Dbaseline>-R (<I>c</I>, yellow). (<I>d</I>-<I>f</I>)=20
            Double-labeling with antibodies to PDGF<IMG alt=3D"alpha "=20
            src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
            align=3Dbaseline>-R (<I>d</I>, green) and GFAP (<I>e</I>, =
red). No=20
            colocalization is observed in the merged image (<I>f</I>).=20
            (<I>g-i</I>) Double-labeling with antibodies to NG2 =
(<I>g</I>, red)=20
            and LCA (<I>h</I>, green). No colocalization is observed in =
the=20
            merged image (<I>i</I>). Tumor =
3.&nbsp;[Bar&nbsp;=3D&nbsp;40&nbsp;=B5m=20
            (<I>a</I>-<I>c</I>), 30&nbsp;=B5m (<I>d</I>-<I>f</I>), and =
20&nbsp;=B5m=20
            (<I>g-i</I>).] <BR=20
clear=3Dleft></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER=
><!-- /FIG 2 --><A=20
name=3DF3><!-- FIG 3 --></A>
<P><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%" border=3D1>
  <TBODY>
  <TR bgColor=3D#e1e1e1>
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        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361/F3"><IMG=20
            height=3D200 hspace=3D10=20
            =
src=3D"http://www.pnas.org/content/vol96/issue18/images/small/pq179272000=
3.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (183K): <BR><NOBR><A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361/F3">[in this=20
            window]</A> <BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F3', 589, 640); =
this.href=3D'/cgi/content-nw/full/96/18/10361/F3'"=20
            =
href=3D"http://www.pnas.org/cgi/content-nw/full/96/18/10361/F3"=20
            target=3DF3>[in a new window]</A><BR>&nbsp; </NOBR></TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG>Fig. 3. &nbsp;</STRONG> =
OLIGO=20
            contain reactive astrocytes, neoplastic GFAP<SUP>+</SUP> =
cells,=20
            residual myelin, and activated microglia. GFAP<SUP>+</SUP> =
cells=20
            were present in all OLIGO (<I>a</I> and <I>b</I>). Many had =
the=20
            appearance of reactive astrocytes (<I>a</I>, arrowhead). =
Occasional=20
            cells had one or two short GFAP<SUP>+</SUP> processes =
(<I>b</I>,=20
            arrowheads) and may reflect neoplastic cells. (<I>c</I>) MBP =

            antibodies stained myelin in normal brain adjacent to OLIGO=20
            (<I>Right</I>) and residual myelin within the tumor =
(<I>Left</I>),=20
            but not neoplastic cells. Arrowheads denote the border =
between tumor=20
            and adjacent normal brain. (<I>d</I>) =
LCA<SUP>+</SUP>-activated=20
            microglia were seen frequently within the neoplasms. =
(<I>a</I> and=20
            <I>b</I>) Tumor 3.&nbsp;(<I>c</I> and <I>d</I>) Tumor=20
            30.&nbsp;[Bar&nbsp;=3D&nbsp;70&nbsp;=B5m (<I>a</I> and =
<I>b</I>),=20
            100&nbsp;=B5m (<I>c</I>), and 60&nbsp;=B5m (<I>d</I>).] <BR=20
          =
clear=3Dleft></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER=
><!-- /FIG 3 -->
<P><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%" border=3D1>
  <TBODY>
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          <TD vAlign=3Dtop align=3Dmiddle=20
            =
bgColor=3D#ffffff><NOBR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</NOBR><BR><NOB=
R><STRONG>View=20
            this table:</STRONG></NOBR> <BR><NOBR><A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361/T1">[in this=20
            window]</A></NOBR><BR><NOBR><A=20
            onmouseover=3D"window.status=3D'View table in a separate =
window';&#10;&#9;&#9;return true"=20
            onclick=3D"startTarget('T1', 500, 400); =
this.href=3D'/cgi/content-nw/full/96/18/10361/T1'"=20
            =
href=3D"http://www.pnas.org/cgi/content-nw/full/96/18/10361/T1"=20
            target=3DT1>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><A name=3DT1><!-- TABLE 1 =
--></A><B>Table=20
            1.</B> &nbsp; NG2 and PDGF<IMG alt=3D"alpha "=20
            src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
            align=3Dbaseline>-R immunostain and Western blot analysis of =

            16&nbsp;brain&nbsp;tumors=20
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>
<P></P>Five of seven OLIGO, three of three PA, and one of five GBM =
contained a=20
large number of cells that stained with anti-human<SUP> </SUP>PDGF<IMG=20
alt=3D"alpha " src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R antibody (Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F1">1</A><I>f</I=
>). The=20
two OLIGO that did not show immunoreactivity<SUP> </SUP>on tissue =
sections=20
showed clear, strong bands on a Western blot<SUP> </SUP>(see below). The =
lack of=20
staining in these cases may be due to<SUP> </SUP>overfixation of the =
specimen or=20
other technical reasons. The morphology<SUP> </SUP>of the PDGF<IMG =
alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R<SUP>+</SUP> tumor cells was similar to that of =
NG2<SUP>+</SUP>=20
tumor cells (Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F1">1</A> =
<I>e</I> and=20
<I>f</I>).=20
<P></P>Double-immunofluorescence labeling by using antibodies against =
human NG2=20
and PDGF<IMG alt=3D"alpha " =
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R was performed on tumors=20
2,&nbsp;3,&nbsp;30,&nbsp;39,<SUP>&nbsp;</SUP>and 44.&nbsp;Confocal=20
laser-scanning microscopy revealed extensive<SUP> </SUP>colocalization =
of these=20
two antigens (Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F2">2</A> =
<I>a-c</I>).=20
<P></P>
<P align=3Dleft><B>GFAP, MBP, and LCA Immunostaining. </B>GFAP<B></B> =
reactivity=20
was detected in normal glia and tumor cells of most of the =
<B></B>OLIGO<B></B>=20
examined in this study. Some of the =
<B></B>GFAP<B><SUP></B>+<B></SUP></B> cells=20
in the <B></B>OLIGO<B></B> had long, ramified processes with large cell =
bodies,=20
suggesting that they are reactive astrocytes (Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F3">3</A><I>a</I=
>). Some=20
<B></B>OLIGO<B></B> contained <B></B>GFAP<B><SUP></B>+<B></SUP></B> =
cells with=20
one or two short processes and nuclei identical to those of neoplastic=20
<B></B>GFAP<B><SUP></B><IMG alt=3D-=20
src=3D"http://www.pnas.org/math/12pt/normal/scr/minus.gif"=20
align=3Dbaseline><B></SUP></B> cells (Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F3">3</A><I>b</I=
>). The=20
morphology is similar to the glial fibrillary oligodendrocytes described =

previously in <B></B>OLIGO<B></B> (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B35">35</A>).=20
Double-labeling of five <B></B>OLIGO<B></B> with antibodies to=20
<B></B>GFAP<B></B> and NG2 or <B></B>GFAP<B></B> and PDGF<IMG =
alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif" =
align=3Dbaseline>-R failed to=20
reveal colocalization in all tumors examined (Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F2">2</A>=20
<I>d</I>-<I>f</I>).<B></B> Immunohistochemistry for MBP was performed in =
five=20
OLIGO. Brain adjacent to tumor showed immunoreactivity in myelinated =
axons<SUP>=20
</SUP>(Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F3">3</A><I>c</I=
>).=20
Residual myelinated fibers within the tumor mass also<SUP> </SUP>were =
stained=20
(Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F3">3</A><I>c</I=
>). MBP=20
antibodies did not label neoplastic<SUP> </SUP>cells in any of the =
OLIGO<SUP>=20
</SUP>examined. </P>Antibodies to LCA were used to identify bone =
marrow-derived=20
cells including microglia in three OLIGO. Variable numbers of<SUP>=20
</SUP>ramified and amoeboid microglia were present within the tumor<SUP> =

</SUP>tissues (Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F3">3</A><I>d</I=
>).=20
Double-labeling by using antibodies to NG2<SUP> </SUP>and LCA showed no=20
colocalization of these antigens (Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F2">2</A>=20
<I>g</I>-<I>i</I>),<SUP> </SUP>indicating that these antibodies =
recognize=20
nonoverlapping populations<SUP> </SUP>of<SUP> </SUP>cells.=20
<P></P>
<P align=3Dleft><B>Western Blot Analysis.</B> Immunoblot analysis of =
solubilized=20
extracts from brain tumors was carried out to confirm the presence of =
PDGF<IMG=20
alt=3D"alpha " src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R and NG2. The R7 anti-human PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif" =
align=3Dbaseline>-R antibody=20
recognized a major component of approximately 180&nbsp;kDa in extracts =
from MG63=20
human osteosarcoma cells, the expected size for the mature PDGF<IMG =
alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif" =
align=3Dbaseline>-R protein,=20
and a faster migrating band at 140&nbsp;kDa (Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F4">4</A> =
<I>Upper</I>),=20
as described previously (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B19">19</A>). =
No clear=20
band was observed in the nonneoplastic human brain extracts (Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F4">4</A> =
<I>Upper</I>).=20
Detectable levels of PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif" =
align=3Dbaseline>-R were=20
identified in all tumor samples. Intense bands were detected in four of =
seven=20
<B></B>OLIGO<B></B>, two of two <B></B>PA<B></B>, one of five =
<B></B>GBM<B></B>,=20
and one of one A (Table <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#T1">1</A>). =
There was no=20
significant difference in the range of band intensities or the average =
intensity=20
seen in the different tumors (Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F4">4</A>=20
<I>Upper</I>).<B></B> Blots also were probed with rabbit anti-rat NG2 =
antibody.=20
A 300-kDa NG2-immunoreactive band was detected in =
chondroitinase-treated<SUP>=20
</SUP>extracts from MG63 cells and two of seven OLIGO, two of two =
PA,<SUP>=20
</SUP>and three of five GBM (Fig. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#F4">4</A> =
<I>Lower</I>).=20
These data support the interpretation<SUP> </SUP>that the =
immunoreactivity=20
observed in the tissue sections represents<SUP> </SUP>the NG2 core =
glycoprotein.=20
We also observed strong bands migrating<SUP> </SUP>at 60-100 kDa. It is =
possible=20
that these bands represent degradation<SUP> </SUP>products of NG2 =
because of=20
delays in freezing of the tissue at<SUP> </SUP>the time of surgery. The =
NG2=20
identified in Western blots of tissue<SUP> </SUP>extracts represents the =
sum of=20
the NG2 produced by the tumor cells<SUP> </SUP>and by endothelial cells. =

Therefore, the amount of NG2 on the<SUP> </SUP>blots is not directly=20
proportional to levels of tumor cell-derived<SUP> </SUP>NG2. <A =
name=3DF4><!-- FIG 4 --></A>
<P><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%" border=3D1>
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
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        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361/F4"><IMG=20
            height=3D133 hspace=3D10=20
            =
src=3D"http://www.pnas.org/content/vol96/issue18/images/small/pq179272000=
4.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (67K): <BR><NOBR><A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361/F4">[in this=20
            window]</A> <BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('F4', 590, 493); =
this.href=3D'/cgi/content-nw/full/96/18/10361/F4'"=20
            =
href=3D"http://www.pnas.org/cgi/content-nw/full/96/18/10361/F4"=20
            target=3DF4>[in a new window]</A><BR>&nbsp; </NOBR></TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG>Fig. 4. &nbsp;</STRONG> =
Western=20
            blots detect PDGF<IMG alt=3D"alpha "=20
            src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
            align=3Dbaseline>-R and NG2 in gliomas. (<I>Upper</I>) =
Although barely=20
            visible in normal brain tissue, PDGF<IMG alt=3D"alpha "=20
            src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
            align=3Dbaseline>-R was detectable in extracts from all =
tumors=20
            examined. (<I>Lower</I>) A 300-kDa band corresponding to the =
NG2=20
            core glycoprotein was present in half of the tumors.=20
            Lower-molecular-weight bands also were seen (see text). B, =
normal=20
            brain; M, human MG63 osteosarcoma cells. <BR=20
        =
clear=3Dleft></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER=
><!-- /FIG 4 -->
<P></P><BR clear=3Dall><A name=3DSEC3><!-- null --></A>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff>&nbsp;<IMG=20
      height=3D21 alt=3D"" hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT=20
      size=3D+2>&nbsp;&nbsp;DISCUSSION</FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1 NOWRAP><R>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#Top"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>TOP</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#Abstract"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>ABSTRACT</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#Introduction"><I=
MG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>INTRODUCTION</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#SEC1"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>MATERIALS AND METHODS</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#SEC2"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>RESULTS</A> <BR><IMG height=3D9 hspace=3D5=20
      src=3D"http://www.pnas.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>DISCUSSION</FONT> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#References"><IMG=
=20
      height=3D9 hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>REFERENCES</A> </FONT></TH></TR></TBODY></TABLE>
<P>All OLIGO and PA examined in this study consisted of cells with =
surface=20
antigens characteristic of oligodendrocyte progenitor<SUP> </SUP>cells. =
There=20
are several possible interpretations of these results:<SUP> </SUP>these =
tumors=20
arise from NG2<SUP>+</SUP>/PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R<SUP>+</SUP> cells, they arise from a less mature =
progenitor=20
cell that acquires<SUP> </SUP>NG2 and PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif" =
align=3Dbaseline>-R=20
immunoreactivity, or they arise from mature cells<SUP> </SUP>that =
acquire NG2=20
and PDGF<IMG alt=3D"alpha " =
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R immunoreactivity as they dedifferentiate.<SUP> =
</SUP>We prefer=20
the first interpretation for the following reasons.<SUP> </SUP>In the =
adult=20
mammalian brain, NG2<SUP>+</SUP>/PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R<SUP>+</SUP> progenitor cells are abundant, are =
located=20
throughout the neuroaxis,<SUP> </SUP>and retain the ability to divide. =
Cell=20
division is an important<SUP> </SUP>characteristic for tumorigenicity =
because it=20
perpetuates alterations<SUP> </SUP>in growth-regulating genes. In =
experimental=20
animals, for example,<SUP> </SUP>proliferating subventricular zone cells =
are=20
more susceptible to<SUP> </SUP>chemically and virally induced =
oncogenesis than=20
less proliferative<SUP> </SUP>brain regions (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B8">8</A>, <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B9">9</A>).=20
NG2<SUP>+</SUP>/PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R<SUP>+</SUP> cells, therefore, have a greater =
predisposition to=20
oncogenesis<SUP> </SUP>than the postmitotic oligodendrocyte. =
Collectively, these=20
observations<SUP> </SUP>support the hypothesis that =
NG2<SUP>+</SUP>/PDGF<IMG=20
alt=3D"alpha " src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R<SUP>+</SUP> cells are the precursors of these =
gliomas. Whether=20
or not these<SUP> </SUP>neoplasms arise from a progenitor to the=20
NG2<SUP>+</SUP>/PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R<SUP>+</SUP> cell can be tested only when markers for =
such=20
progenitors are<SUP> </SUP>discovered. Dedifferentation of =
oligodendrocytes to=20
cells with<SUP> </SUP>progenitor phenotypes has not been described <I>in =

vitro</I> or <I>in vivo</I>;<SUP> </SUP>therefore, it is unlikely that =
OLIGO=20
arise from mature oligodendrocytes<SUP> </SUP>that lose their myelin =
markers=20
while regaining characteristics<SUP> </SUP>of their precursors. Our =
results=20
confirm previous reports (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B36">36-38</A>)<=
SUP>=20
</SUP>that mature oligodendrocyte markers are not expressed by the=20
neoplastic<SUP> </SUP>cells in OLIGO. Recently, mRNA encoding=20
oligodendrocyte-specific<SUP> </SUP>proteins was reported in OLIGO (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B39">39</A>), =
however our=20
results and<SUP> </SUP>other studies (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B40">40</A>) =
indicate=20
that these myelin protein gene products<SUP> </SUP>are located within=20
preexisting myelinating<SUP> </SUP>oligodendrocytes. </P>
<P>A provocative finding of this study was the detection of high levels =
of NG2=20
and PDGF<IMG alt=3D"alpha " =
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R in PA. Although OLIGO and PA are viewed<SUP> =
</SUP>as distinct=20
clinical and pathological entities, they share several<SUP> =
</SUP>interesting=20
properties (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B3">3</A>). =
Both are=20
typically slowly growing<SUP> </SUP>tumors and have better prognoses =
than=20
fibrillary astrocytomas.<SUP> </SUP>Both PA and low-grade OLIGO are=20
cytologically benign but often<SUP> </SUP>histologically heterogeneous. =
PA=20
characteristically have a biphasic<SUP> </SUP>histology composed of =
compact=20
areas containing bipolar cells and<SUP> </SUP>microcystic areas composed =
of=20
stellate cells. Some PA can even<SUP> </SUP>have areas histologically =
identical=20
to OLIGO (<A =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B3">3</A>).=20
Our results<SUP> </SUP>show that antibodies to NG2 and PDGF<IMG =
alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif" =
align=3Dbaseline>-R labeled=20
the round cells<SUP> </SUP>of OLIGO and both the stellate cells and =
bipolar=20
cells of PA.<SUP> </SUP>These observations suggest that NG2<SUP>+</SUP> =
cells=20
have the potential give rise to neoplasms with distinctive<SUP> =
</SUP>clinical=20
and pathological phenotypes, perhaps as a result of different<SUP>=20
</SUP>environmental influences within the brain parenchyma or =
different<SUP>=20
</SUP>acquired genetic alterations. In support of environmental =
influences,<SUP>=20
</SUP>PA are most commonly located in the cerebellum, optic nerve, =
and<SUP>=20
</SUP>hypothalamus, whereas OLIGO usually are located in the =
cerebral<SUP>=20
</SUP>hemispheres. PA also typically occur at an earlier age than =
OLIGO<SUP>=20
</SUP>(<A =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B3">3</A>).=20
Genetic changes are rarely described in PA, whereas loss<SUP> </SUP>of=20
heterozygosity in chromosomes 1p and 19q are common in OLIGO<SUP> =
</SUP>(<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B41">41-43</A>).=
 These=20
genetic alterations may predispose OLIGO to histological<SUP> =
</SUP>progression,=20
which is rare in PA. </P>
<P>NG2 immunoreactivity was observed in four of five GBM examined; =
however, in=20
three of these cases, the staining was restricted<SUP> </SUP>to =
capillary=20
endothelial cells. The expression of NG2 by endothelial<SUP> </SUP>cells =
most=20
likely accounts for the NG2 seen in our Western blots<SUP> </SUP>of GBM. =
Strong=20
staining of capillaries and weak staining of tumor<SUP> </SUP>cells with =

antibody to NG2 has been reported previously (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B31">31</A>).<SU=
P>=20
</SUP>In our series, one of five GBM showed strong immunoreactivity<SUP> =

</SUP>for both NG2 and PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif" =
align=3Dbaseline>-R on the=20
majority of tumor cells. This<SUP> </SUP>GBM was histologically=20
indistinguishable from the others examined.<SUP> </SUP>High expression =
of=20
PDGF<IMG alt=3D"alpha " =
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R was detected on Western blots of two<SUP> =
</SUP>additional=20
astrocytomas (one low grade and one GBM). Although<SUP> </SUP>we did not =
observe=20
PDGF<IMG alt=3D"alpha " =
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R immunoreactivity on tissue sections<SUP> </SUP>from =
these=20
tumors, we believe this was a result of overfixation.<SUP> </SUP>High =
expression=20
of PDGF<IMG alt=3D"alpha " =
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R mRNA in a variety of glial neoplasms<SUP> </SUP>is =
well=20
documented in the literature (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B12">12</A>, <A =

href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B44">44-48</A>),=
 and the=20
possibility<SUP> </SUP>that endogenous PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R<SUP>+</SUP> cells are the precursors to gliomas has =
been noted=20
previously<SUP> </SUP>(<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B12">12</A>, <A =

href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B48">48</A>). =
Detection=20
of both NG2 and PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif" =
align=3Dbaseline>-R on a=20
subset of<SUP> </SUP>GBM, in addition to OLIGO and PA, supports the =
notion that=20
multiple<SUP> </SUP>types of glial neoplasms arise from the=20
NG2<SUP>+</SUP>/PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R<SUP>+</SUP> progenitor cell. Gliomas that do not =
express NG2=20
and PDGF<IMG alt=3D"alpha " =
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R<SUP> </SUP>may have down-regulated these markers =
because of=20
acquired genetic<SUP> </SUP>changes or environmental influences. =
Alternatively,=20
they may have<SUP> </SUP>arisen from a different<SUP> </SUP>progenitor. =
</P>
<P>At least three distinct glial progenitor cells may exist in the adult =
central=20
nervous system. The NG2<SUP>+</SUP>/PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R<SUP>+</SUP> cells have been studied extensively =
<I>in=20
vitro</I>, where they have<SUP> </SUP>been referred to as O-2A =
progenitor cells=20
because they can differentiate<SUP> </SUP>into oligodendrocytes in =
serum-free=20
medium and type 2&nbsp;astrocytes<SUP> </SUP>in serum-containing medium =
(<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B13">13</A>). =
To date,=20
bipotentiality of<SUP> </SUP>NG2<SUP>+</SUP>/PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R<SUP>+</SUP> cells has not been demonstrated in the =
normal=20
brain <I>in vivo</I>;<SUP> </SUP>however, as discussed above, neoplastic =

NG2<SUP>+</SUP>/PDGF<IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R<SUP>+</SUP> cells may have the potential to display =
either=20
OLIGO or PA characteristics.<SUP> </SUP>A number of gliomas show a mixed =

OLIGO/fibrillary astrocytoma<SUP> </SUP>phenotype (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B3">3</A>). =
Loss of=20
heterozygosity of chromosomes 1p and<SUP> </SUP>19q occurs in both the =
OLIGO and=20
the astrocytoma areas of the<SUP> </SUP>tumors, indicating that some =
OLIGO and=20
fibrillary astrocytomas<SUP> </SUP>have a common origin (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B43">43</A>). =
<I>In=20
vitro</I> studies have characterized<SUP> </SUP>another astrocyte, =
termed type=20
1,&nbsp;which does not arise from the<SUP> </SUP>O-2A progenitor cell =
(<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B13">13</A>). =
Studies on=20
the type 1&nbsp;astrocyte progenitor<SUP> </SUP>have lagged, and =
phenotypic=20
markers for this progenitor have not<SUP> </SUP>been reported. It is =
possible=20
that this cell also is present in<SUP> </SUP>the adult central nervous =
system=20
and is the source of tumors with<SUP> </SUP>more astrocytic =
characteristics.=20
Other possible progenitors in<SUP> </SUP>adult brain include multipotent =
glial=20
stem cells and multipotent<SUP> </SUP>neuroepithelial stem cells (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B49">49</A>, <A =

href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B50">50</A>). =
Such cells=20
have the capacity<SUP> </SUP>to differentiate when injected into =
neonatal rodent=20
brain (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B49">49</A>,<SUP=
>=20
</SUP><A =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B51">51</A>).=20
Further characterization of these progenitor cells <I>in vitro</I><SUP>=20
</SUP>and <I>in vivo</I> is essential for testing their potential role =
in=20
glial<SUP> </SUP>tumorigenesis. In addition, application of progenitor =
cell=20
culture<SUP> </SUP>techniques to primary glioma specimens may provide =
better=20
<I>in vitro</I><SUP> </SUP>models for glioma research (for review see =
ref. <A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B11">11</A>). =
</P>
<P>Studying glial tumors from the viewpoint of progenitor cell biology =
will help=20
identify markers that may facilitate diagnosis,<SUP> </SUP>predict =
prognosis,=20
and direct therapy. This is particularly important<SUP> </SUP>for OLIGO =
because=20
there is often disagreement among pathologists<SUP> </SUP>regarding the =
criteria=20
for diagnosis of this glioma (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B52">52</A>). =
The<SUP>=20
</SUP>most common differential diagnosis is OLIGO vs. fibrillary=20
astrocytoma.<SUP> </SUP>The majority of patients with anaplastic OLIGO =
show a=20
response<SUP> </SUP>to chemotherapy (<A=20
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B28">28</A>, <A =

href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#B29">29</A>), =
but this=20
option might not be offered<SUP> </SUP>to a patient given a diagnosis of =

astrocytoma. Our results also<SUP> </SUP>should stimulate research into =
new=20
treatments. For example, cell<SUP> </SUP>surface molecules such as NG2 =
and=20
PDGF<IMG alt=3D"alpha " =
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R could be targets for<SUP> </SUP>cytotoxic therapies. =
From a=20
broader perspective, investigation<SUP> </SUP>of the pathways that =
regulate the=20
proliferation, survival, or<SUP> </SUP>migration of normal progenitor =
cells may=20
identify additional targets<SUP> </SUP>for therapy of<SUP> =
</SUP>gliomas.=20
</P></TXT><!-- Stray figures and tables --><!-- Acknowledgements --><A =
name=3Dack><!-- comment for mosaic --></A><BR clear=3Dall>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff>&nbsp;<IMG=20
      height=3D21 alt=3D"" hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT=20
      =
size=3D+2>&nbsp;&nbsp;ACKNOWLEDGEMENTS</FONT></TH></TR></TBODY></TABLE>
<P>We thank Drs. W.&nbsp;B.&nbsp;Stallcup, C.-H. Heldin, and =
R.&nbsp;Reisfeld=20
for antibodies and Dr. Xinghua Yin for figure preparation. Dr.<SUP> =
</SUP>M=F6rk=20
was on sabbatical leave from the Department of Pathology,<SUP> =
</SUP>University=20
of Bergen, Norway. Dr. Nishiyama's current address<SUP> </SUP>is =
Department of=20
Physiology and Neurobiology, University of Connecticut,<SUP> =
</SUP>Storrs, CT.=20
This work was supported by National Institutes of<SUP> </SUP>Health =
Grant=20
NS35058 (B.D.T.) and by the John Gagliarducci Fund<SUP> </SUP>(Y.S.). =
This paper=20
is dedicated to the memory of Tim<SUP> </SUP>Gullickson. </P><!-- Notes =
--><!-- Abbreviations --><A=20
name=3Dabb><!-- comment for mosaic --></A><BR clear=3Dall>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff>&nbsp;<IMG=20
      height=3D21 alt=3D"" hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT=20
      =
size=3D+2>&nbsp;&nbsp;ABBREVIATIONS</FONT></TH></TR></TBODY></TABLE>
<P>PDGF<IMG alt=3D"alpha " =
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif"=20
align=3Dbaseline>-R, <IMG alt=3D"alpha "=20
src=3D"http://www.pnas.org/math/12pt/normal/alpha.gif" align=3Dbaseline> =
receptor of=20
platelet-derived growth factor; GBM, glioblastoma multiforme; OLIGO,=20
oligodendroglioma, AOLIGO, anaplastic oligodendroglioma; GFAP, glial =
fibrillary=20
acidic protein; MBP, myelin basic protein; LCA, leukocyte common =
antigen; PA,=20
pilocytic astrocytoma; A, fibrillary astrocytoma. </P><!-- Footnotes =
--><A=20
name=3Dfoo><!-- comment for mosaic --></A><BR clear=3Dall>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff>&nbsp;<IMG=20
      height=3D21 alt=3D"" hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT=20
      size=3D+2>&nbsp;&nbsp;FOOTNOTES</FONT></TH></TR></TBODY></TABLE>
<P><A name=3DFN152><SUP><IMG alt=3D"Dagger "=20
src=3D"http://www.pnas.org/math/12pt/normal/scr/Dagger.gif"=20
align=3Dbaseline></SUP></A> Present address: Department of Neurosurgery, =
Hadassah=20
University Hospital, Jerusalem, Israel<SUP> </SUP>91120.=20
<P>
<P><A name=3DFN153><SUP>=A7</SUP></A> Present address: Department of =
Physiology and=20
Neurobiology, University of Connecticut, Storrs, CT<SUP> </SUP>06269.=20
<P>
<P><A name=3DFN154><SUP>=B6</SUP></A> To whom reprint requests should be =
addressed=20
at: Department of Neurosciences #NC30, Cleveland Clinic Foundation,=20
9500&nbsp;Euclid<SUP> </SUP>Avenue, Cleveland, OH 44195.&nbsp;E-mail: =
<SPAN=20
id=3Dem0>staugas{at}ccf.org</SPAN>
<SCRIPT type=3Dtext/javascript><!--=0A=
 var u =3D "staugas", d =3D "ccf.org"; =
document.getElementById("em0").innerHTML =3D '<a href=3D"mailto:' + u + =
'@' + d + '">' + u + '@' + d + '<\/a>'//--></SCRIPT>
.=20
<P><!-- Appendices --><!-- Bibliography --><BR clear=3Dall><A =
name=3DReferences><!-- null --></A>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" =
bgColor=3D#ffffff>&nbsp;<IMG=20
      height=3D21 alt=3D"" hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/rarrow.gif"=20
      width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT=20
      size=3D+2>&nbsp;&nbsp;REFERENCES</FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1 NOWRAP><R>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#Top"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>TOP</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#Abstract"><IMG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>ABSTRACT</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#Introduction"><I=
MG=20
      height=3D9 hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>INTRODUCTION</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#SEC1"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>MATERIALS AND METHODS</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#SEC2"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>RESULTS</A> <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/full/96/18/10361#SEC3"><IMG =
height=3D9=20
      hspace=3D5 src=3D"http://www.pnas.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>DISCUSSION</A> <BR><IMG height=3D9 hspace=3D5=20
      src=3D"http://www.pnas.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>REFERENCES</FONT> =
</FONT></TH></TR></TBODY></TABLE><BR clear=3Dall>
<TABLE border=3D0>
  <TBODY>
  <TR>
    <TD vAlign=3Dtop><A name=3DB1>1.</A>=20
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Classification of=20
      Tumors of the Glioma Group on a Histogenesis Basis with a =
Correlated Study=20
      of Prognosis</I> (Lippincott, Philadelphia)<!-- HIGHWIRE =
ID=3D"96:18:10361:1" --><!-- /HIGHWIRE -->. </TD>
  <TR>
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    <TD vAlign=3Dtop>Kleihues, P., Burger, P. C. &amp; Scheithauer, B. =
W. (1993)=20
      <I>Histological Typing of Tumors of the Central Nervous System. =
World=20
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ID=3D"96:18:10361:2" --><!-- /HIGHWIRE -->. </TD>
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<I>Tumors of=20
      the Central Nervous System</I> (Armed Forces Institute of =
Pathology,=20
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/HIGHWIRE -->. </TD>
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--><A=20
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&amp;link_type=3DISI">[ISI]</A><!-- /HIGHWIRE -->.=20
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  <TR>
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ID=3D"96:18:10361:5" --><!-- /HIGHWIRE -->. </TD>
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<B>217</B>,=20
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href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D10.1038/217974a=
0&amp;link_type=3DDOI">[CrossRef]</A><A=20
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href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D4966809&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
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<I>Experientia</I>=20
      <B>32</B>, 1467-1468 <!-- HIGHWIRE ID=3D"96:18:10361:8" --><A=20
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href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D10.1007/BF01937=
439&amp;link_type=3DDOI">[CrossRef]</A><A=20
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href=3D"http://www.pnas.org/cgi/external_ref?access_num=3DA1976CL68600065=
&amp;link_type=3DISI">[ISI]</A><A=20
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href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D992001&amp;link=
_type=3DMED">[Medline]</A>=20
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<I>Acta=20
      Neuropathol.</I> <B>40</B>, 63-71 <!-- HIGHWIRE =
ID=3D"96:18:10361:9" --><A=20
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href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D10.1007/BF00688=
574&amp;link_type=3DDOI">[CrossRef]</A><A=20
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href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D199034&amp;link=
_type=3DMED">[Medline]</A>=20
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J.&nbsp;Pathol.</I>=20
      <B>135</B>, 529-540 <!-- HIGHWIRE ID=3D"96:18:10361:10" --><A=20
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href=3D"http://www.pnas.org/cgi/ijlink?linkType=3DABST&amp;journalCode=3D=
amjpathol&amp;resid=3D135/3/529">[Abstract]</A><!-- /HIGHWIRE -->.=20
    </TD>
  <TR>
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Linskey, M.,=20
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k_type=3DMED">[Medline]</A>=20
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href=3D"http://www.pnas.org/cgi/ijlink?linkType=3DABST&amp;journalCode=3D=
canres&amp;resid=3D56/1/164"><NOBR>[Abstract/<FONT=20
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/HIGHWIRE -->.=20
    </TD>
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<I>Nature=20
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0&amp;link_type=3DDOI">[CrossRef]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D6304520&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB14>14.</A>=20
    <TD vAlign=3Dtop>Noble, M., Murray, K., Stroobant, P., Waterfield, =
M. D.=20
      &amp; Riddle, P. (1988) <I>Nature (London)</I> <B>333</B>, 560-562 =
<!-- HIGHWIRE ID=3D"96:18:10361:14" --><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D10.1038/333560a=
0&amp;link_type=3DDOI">[CrossRef]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D3287176&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB15>15.</A>=20
    <TD vAlign=3Dtop>Raff, M. C., Lillien, L. E., Richardson, W. D., =
Burne, J.=20
      F. &amp; Noble, M. D. (1988) <I>Nature (London)</I> <B>333</B>, =
562-565 <!-- HIGHWIRE ID=3D"96:18:10361:15" --><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D10.1038/333562a=
0&amp;link_type=3DDOI">[CrossRef]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D3287177&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB16>16.</A>=20
    <TD vAlign=3Dtop>Richardson, W. D., Pringle, N., Mosley, M. J., =
Westermark,=20
      B. &amp; Dubois-Dalcq, M. (1988) <I>Cell</I> <B>53</B>, 309-319 =
<!-- HIGHWIRE ID=3D"96:18:10361:16" --><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D10.1016/0092-86=
74(88)90392-3&amp;link_type=3DDOI">[CrossRef]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3DA1988N126600016=
&amp;link_type=3DISI">[ISI]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D2834067&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB17>17.</A>=20
    <TD vAlign=3Dtop>Hart, I. K., Richardson, W. D., Heldin, C.-H., =
Westermark,=20
      B. &amp; Raff, M. C. (1989) <I>Development (Cambridge, U.K.)</I>=20
      <B>105</B>, 595-603 <!-- HIGHWIRE ID=3D"96:18:10361:17" --><A=20
      =
href=3D"http://www.pnas.org/cgi/ijlink?linkType=3DABST&amp;journalCode=3D=
develop&amp;resid=3D105/3/595"><NOBR>[Abstract/<FONT=20
      color=3D#cc0000>Free</FONT>&nbsp;Full&nbsp;Text]</NOBR></A><!-- =
/HIGHWIRE -->.=20
    </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB18>18.</A>=20
    <TD vAlign=3Dtop>Nishiyama, A., Lin, X. H., Giese, N., Heldin, C. H. =
&amp;=20
      Stallcup, W. B. (1996) <I>J. Neurosci. Res.</I> <B>43</B>, 299-314 =
<!-- HIGHWIRE ID=3D"96:18:10361:18" --><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D10.1002/(SICI)1=
097-4547(19960201)43:3<299::AID-JNR5>3.0.CO;2-E&amp;link_type=3DDOI">[Cro=
ssRef]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3DA1996TT53000005=
&amp;link_type=3DISI">[ISI]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D8714519&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB19>19.</A>=20
    <TD vAlign=3Dtop>Nishiyama, A., Lin, X. H., Giese, N., Heldin, C. H. =
&amp;=20
      Stallcup, W. B. (1996) <I>J. Neurosci. Res.</I> <B>43</B>, 315-330 =
<!-- HIGHWIRE ID=3D"96:18:10361:19" --><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D10.1002/(SICI)1=
097-4547(19960201)43:3<315::AID-JNR6>3.0.CO;2-M&amp;link_type=3DDOI">[Cro=
ssRef]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3DA1996TT53000006=
&amp;link_type=3DISI">[ISI]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D8714520&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB20>20.</A>=20
    <TD vAlign=3Dtop>Levine, J. M. &amp; Nishiyama, A. (1996) =
<I>Perspect. Dev.=20
      Neurobiol.</I> <B>3</B>, 245-259 <!-- HIGHWIRE =
ID=3D"96:18:10361:20" --><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3DA1996VW97100002=
&amp;link_type=3DISI">[ISI]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D9117258&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB21>21.</A>=20
    <TD vAlign=3Dtop>Nishiyama, A., Dahlin, K. &amp; Stallcup, W. B. =
(1991)=20
      <I>Development (Cambridge, U.K.)</I> <B>111</B>, 933-944 <!-- =
HIGHWIRE ID=3D"96:18:10361:21" --><A=20
      =
href=3D"http://www.pnas.org/cgi/ijlink?linkType=3DABST&amp;journalCode=3D=
develop&amp;resid=3D111/4/933"><NOBR>[Abstract/<FONT=20
      color=3D#cc0000>Free</FONT>&nbsp;Full&nbsp;Text]</NOBR></A><!-- =
/HIGHWIRE -->.=20
    </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB22>22.</A>=20
    <TD vAlign=3Dtop>Grako, K. A. &amp; Stallcup, W. B. (1995) <I>Exp. =
Cell=20
      Res.</I> <B>221</B>, 231-240 <!-- HIGHWIRE ID=3D"96:18:10361:22" =
--><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D10.1006/excr.19=
95.1371&amp;link_type=3DDOI">[CrossRef]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3DA1995TB69100026=
&amp;link_type=3DISI">[ISI]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D7589250&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB23>23.</A>=20
    <TD vAlign=3Dtop>Real, F. X., Houghton, A. N., Albino, A. P., =
Cordon-Cardo,=20
      C., Melamed, M. R., Oettgen, H. F. &amp; Old, L. J. (1985) =
<I>Cancer=20
      Res.</I> <B>45</B>, 4401-4411 <!-- HIGHWIRE ID=3D"96:18:10361:23" =
--><A=20
      =
href=3D"http://www.pnas.org/cgi/ijlink?linkType=3DABST&amp;journalCode=3D=
canres&amp;resid=3D45/9/4401"><NOBR>[Abstract/<FONT=20
      color=3D#cc0000>Free</FONT>&nbsp;Full&nbsp;Text]</NOBR></A><!-- =
/HIGHWIRE -->.=20
    </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB24>24.</A>=20
    <TD vAlign=3Dtop>Levine, J. M., Stincone, F. &amp; Lee, Y. S. (1993) =

      <I>Glia</I> <B>7</B>, 307-321 <!-- HIGHWIRE ID=3D"96:18:10361:24" =
--><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D10.1002/glia.44=
0070406&amp;link_type=3DDOI">[CrossRef]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3DA1993KT19300005=
&amp;link_type=3DISI">[ISI]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D8320001&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB25>25.</A>=20
    <TD vAlign=3Dtop>Reynolds, R. &amp; Hardy, R. (1997) <I>J. Neurosci. =

      Res.</I> <B>47</B>, 455-470 <!-- HIGHWIRE ID=3D"96:18:10361:25" =
--><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D10.1002/(SICI)1=
097-4547(19970301)47:5<455::AID-JNR1>3.0.CO;2-G&amp;link_type=3DDOI">[Cro=
ssRef]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3DA1997WL66100001=
&amp;link_type=3DISI">[ISI]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D9067855&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB26>26.</A>=20
    <TD vAlign=3Dtop>Nishiyama, A., Yu, M., Drazba, J. A. &amp; Tuohy, =
V. K.=20
      (1997) <I>J. Neurosci. Res.</I> <B>48</B>, 299-312 <!-- HIGHWIRE =
ID=3D"96:18:10361:26" --><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D10.1002/(SICI)1=
097-4547(19970515)48:4<299::AID-JNR2>3.0.CO;2-6&amp;link_type=3DDOI">[Cro=
ssRef]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3DA1997XB13000002=
&amp;link_type=3DISI">[ISI]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D9169856&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB27>27.</A>=20
    <TD vAlign=3Dtop>Trapp, B. D., Nishiyama, A., Cheng, D. &amp; =
Macklin, W.=20
      (1997) <I>J. Cell Biol.</I> <B>137</B>, 459-468 <!-- HIGHWIRE =
ID=3D"96:18:10361:27" --><A=20
      =
href=3D"http://www.pnas.org/cgi/ijlink?linkType=3DABST&amp;journalCode=3D=
jcb&amp;resid=3D137/2/459"><NOBR>[Abstract/<FONT=20
      color=3D#cc0000>Free</FONT>&nbsp;Full&nbsp;Text]</NOBR></A><!-- =
/HIGHWIRE -->.=20
    </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB28>28.</A>=20
    <TD vAlign=3Dtop>Macdonald, D. R., Gaspar, L. E. &amp; Cairncross, =
J. G.=20
      (1990) <I>Ann. Neurol.</I> <B>27</B>, 573-574 <!-- HIGHWIRE =
ID=3D"96:18:10361:28" --><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D10.1002/ana.410=
270519&amp;link_type=3DDOI">[CrossRef]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3DA1990DE69500018=
&amp;link_type=3DISI">[ISI]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D2360797&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB29>29.</A>=20
    <TD vAlign=3Dtop>Cairncross, J. G., Ueki, K., Zlatescu, M. C., =
Lisle, D. K.,=20
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Cancer.=20
      Inst.</I> <B>90</B>, 1473-1479 <!-- HIGHWIRE ID=3D"96:18:10361:29" =
--><A=20
      =
href=3D"http://www.pnas.org/cgi/ijlink?linkType=3DABST&amp;journalCode=3D=
jnci&amp;resid=3D90/19/1473"><NOBR>[Abstract/<FONT=20
      color=3D#cc0000>Free</FONT>&nbsp;Full&nbsp;Text]</NOBR></A><!-- =
/HIGHWIRE -->.=20
    </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB30>30.</A>=20
    <TD vAlign=3Dtop>Bumol, T. F. &amp; Reisfeld, R. A. (1982) <I>Proc. =
Natl.=20
      Acad. Sci. USA</I> <B>79</B>, 1245-1249 <!-- HIGHWIRE =
ID=3D"96:18:10361:30" --><A=20
      =
href=3D"http://www.pnas.org/cgi/ijlink?linkType=3DABST&amp;journalCode=3D=
pnas&amp;resid=3D79/4/1245"><NOBR>[Abstract/<FONT=20
      color=3D#cc0000>Free</FONT>&nbsp;Full&nbsp;Text]</NOBR></A><!-- =
/HIGHWIRE -->.=20
    </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB31>31.</A>=20
    <TD vAlign=3Dtop>Schrappe, M., Klier, F. G., Spiro, R. C., Waltz, T. =
A.,=20
      Reisfeld, R. A. &amp; Gladson, C. L. (1991) <I>Cancer Res.</I> =
<B>51</B>,=20
      4986-4993 <!-- HIGHWIRE ID=3D"96:18:10361:31" --><A=20
      =
href=3D"http://www.pnas.org/cgi/ijlink?linkType=3DABST&amp;journalCode=3D=
canres&amp;resid=3D51/18/4986"><NOBR>[Abstract/<FONT=20
      color=3D#cc0000>Free</FONT>&nbsp;Full&nbsp;Text]</NOBR></A><!-- =
/HIGHWIRE -->.=20
    </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB32>32.</A>=20
    <TD vAlign=3Dtop>Eriksson, A., Siegbahn, A., Westermark, B., Heldin, =
C. H.=20
      &amp; Claesson-Welsh, L. (1992) <I>EMBO J.</I> <B>11</B>, 543-550 =
<!-- HIGHWIRE ID=3D"96:18:10361:32" --><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3DA1992HE19300020=
&amp;link_type=3DISI">[ISI]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D1311251&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB33>33.</A>=20
    <TD vAlign=3Dtop>Nishiyama, A., Dahlin, K., Prince, J., Johnstone, =
S. &amp;=20
      Stallcup, W. B. (1991) <I>J. Cell Biol.</I> <B>114</B>, 359-371 =
<!-- HIGHWIRE ID=3D"96:18:10361:33" --><A=20
      =
href=3D"http://www.pnas.org/cgi/ijlink?linkType=3DABST&amp;journalCode=3D=
jcb&amp;resid=3D114/2/359"><NOBR>[Abstract/<FONT=20
      color=3D#cc0000>Free</FONT>&nbsp;Full&nbsp;Text]</NOBR></A><!-- =
/HIGHWIRE -->.=20
    </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB34>34.</A>=20
    <TD vAlign=3Dtop>Pluschke, G., Vanek, M., Evans, A., Dittmar, T., =
Schmid,=20
      P., Itin, P., Filardo, E. &amp; Reisfeld, R. A. (1996) <I>Proc. =
Natl.=20
      Acad. Sci. USA</I> <B>93</B>, 9710-9715 <!-- HIGHWIRE =
ID=3D"96:18:10361:34" --><A=20
      =
href=3D"http://www.pnas.org/cgi/ijlink?linkType=3DABST&amp;journalCode=3D=
pnas&amp;resid=3D93/18/9710"><NOBR>[Abstract/<FONT=20
      color=3D#cc0000>Free</FONT>&nbsp;Full&nbsp;Text]</NOBR></A><!-- =
/HIGHWIRE -->.=20
    </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB35>35.</A>=20
    <TD vAlign=3Dtop>Herpers, M. J. &amp; Budka, H. (1984) <I>Acta=20
      Neuropathol.</I> <B>64</B>, 265-272=20
      <!-- HIGHWIRE ID=3D"96:18:10361:35" --><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D10.1007/BF00690=
392&amp;link_type=3DDOI">[CrossRef]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D6391068&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB36>36.</A>=20
    <TD vAlign=3Dtop>Sung, C., Collins, R., Li, J., Pearl, D. K., Coons, =
S. W.,=20
      Scheithauer, B. W., Johnson, P. C. &amp; Yates, A. J. (1996) =
<I>Glycoconj.=20
      J.</I> <B>13</B>, 433-443 <!-- HIGHWIRE ID=3D"96:18:10361:36" =
--><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D10.1007/BF00731=
476&amp;link_type=3DDOI">[CrossRef]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D8781974&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB37>37.</A>=20
    <TD vAlign=3Dtop>Kamitani, H., Masuzawa, H., Sato, J. &amp; =
Kanazawa, I.=20
      (1988) <I>J. Neurol. Sci.</I> <B>83</B>, 219-225 <!-- HIGHWIRE =
ID=3D"96:18:10361:37" --><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D2451711&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB38>38.</A>=20
    <TD vAlign=3Dtop>Kennedy, P. G., Watkins, B. A., Thomas, D. G. &amp; =
Noble,=20
      M. D. (1987) <I>Neuropathol. Appl. Neurobiol.</I> <B>13</B>, =
327-347 <!-- HIGHWIRE ID=3D"96:18:10361:38" --><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D3317103&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB39>39.</A>=20
    <TD vAlign=3Dtop>Golfinos, J. G., Norman, S. A., Coons, S. W., =
Norman, R.=20
      A., Ballecer, C. &amp; Scheck, A. C. (1997) <I>Clin. Cancer =
Res.</I>=20
      <B>3</B>, 799-804 <!-- HIGHWIRE ID=3D"96:18:10361:39" --><A=20
      =
href=3D"http://www.pnas.org/cgi/ijlink?linkType=3DABST&amp;journalCode=3D=
clincanres&amp;resid=3D3/5/799">[Abstract]</A><!-- /HIGHWIRE -->.=20
    </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB40>40.</A>=20
    <TD vAlign=3Dtop>Landry, C. F., Verity, M. A., Cherman, L., Kashima, =
T.,=20
      Black, K., Yates, A. &amp; Campagnoni, A. T. (1997) <I>Cancer =
Res.</I>=20
      <B>57</B>, 4098-4104 <!-- HIGHWIRE ID=3D"96:18:10361:40" --><A=20
      =
href=3D"http://www.pnas.org/cgi/ijlink?linkType=3DABST&amp;journalCode=3D=
canres&amp;resid=3D57/18/4098"><NOBR>[Abstract/<FONT=20
      color=3D#cc0000>Free</FONT>&nbsp;Full&nbsp;Text]</NOBR></A><!-- =
/HIGHWIRE -->.=20
    </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB41>41.</A>=20
    <TD vAlign=3Dtop>Lang, F. F., Miller, D. C., Pisharody, S., Koslow, =
M. &amp;=20
      Newcomb, E. W. (1994) <I>Oncogene</I> <B>9</B>, 949-954 <!-- =
HIGHWIRE ID=3D"96:18:10361:41" --><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3DA1994MW55100033=
&amp;link_type=3DISI">[ISI]</A><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D8108140&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE -->. </TD>
  <TR>
    <TD vAlign=3Dtop><A name=3DB42>42.</A>=20
    <TD vAlign=3Dtop>Patt, S., Gries, H., Giraldo, M., Cervos-Navarro, =
J.,=20
      Martin, H., Janisch, W. &amp; Brockmoller, J. (1996) <I>Hum. =
Pathol.</I>=20
      <B>27</B>, 586-589 <!-- HIGHWIRE ID=3D"96:18:10361:42" --><A=20
      =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D10.1016/S0046-8=
177(96)90166-5&amp;link_type=3DDOI">[CrossRef]</A><A=20
      =
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href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D8666369&amp;lin=
k_type=3DMED">[Medline]</A>=20
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&amp;link_type=3DISI">[ISI]</A><A=20
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href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D7815084&amp;lin=
k_type=3DMED">[Medline]</A>=20
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    <TD vAlign=3Dtop><A name=3DB44>44.</A>=20
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      <I>Pediatr. Neurosurg.</I> <B>24</B>, 74-78 <!-- HIGHWIRE =
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k_type=3DMED">[Medline]</A>=20
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    <TD vAlign=3Dtop><A name=3DB45>45.</A>=20
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P. M.=20
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3-199802000-00080&amp;link_type=3DDOI">[CrossRef]</A><A=20
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    <TD vAlign=3Dtop><A name=3DB46>46.</A>=20
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k_type=3DMED">[Medline]</A>=20
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    <TD vAlign=3Dtop><A name=3DB47>47.</A>=20
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canres&amp;resid=3D52/16/4550"><NOBR>[Abstract/<FONT=20
      color=3D#cc0000>Free</FONT>&nbsp;Full&nbsp;Text]</NOBR></A><!-- =
/HIGHWIRE -->.=20
    </TD>
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Claesson-Welsh, L.,=20
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canres&amp;resid=3D52/11/3213"><NOBR>[Abstract/<FONT=20
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/HIGHWIRE -->.=20
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sci&amp;resid=3D276/5309/66"><NOBR>[Abstract/<FONT=20
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/HIGHWIRE -->.=20
    </TD>
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pnas&amp;resid=3D95/7/3996"><NOBR>[Abstract/<FONT=20
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href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D9831032&amp;lin=
k_type=3DMED">[Medline]</A>=20
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<!-- /HIGHWIRE -->. </TD></TR></TBODY></TABLE>
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
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href=3D"http://www.genesdev.org/"><IMG=20
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      =
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size=3D-1>C.=20
      Dai, J. C. Celestino, Y. Okada, D. N. Louis, G. N. Fuller, and E. =
C.=20
      Holland<BR><STRONG>PDGF autocrine stimulation dedifferentiates =
cultured=20
      astrocytes and induces oligodendrogliomas and oligoastrocytomas =
from=20
      neural progenitors and astrocytes in vivo</STRONG><BR>Genes &amp; =
Dev.,=20
      August&nbsp;1,&nbsp;2001; 15(15): 1913 - 1925. <BR><A=20
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href=3D"http://www.genesdev.org/cgi/content/abstract/15/15/1913">[Abstrac=
t]</A>=20
      <A =
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href=3D"http://www.jneurosci.org/"><IMG=20
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size=3D-1>A. I.=20
      Flores, B. S. Mallon, T. Matsui, W. Ogawa, A. Rosenzweig, T. =
Okamoto, and=20
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href=3D"http://www.jneurosci.org/cgi/content/abstract/20/20/7622">[Abstra=
ct]</A>=20
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href=3D"http://www.jneurosci.org/cgi/content/full/20/20/7622">[Full=20
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      Cairncross<BR><STRONG>Differential Expression of Drug Resistance =
Genes and=20
      Chemosensitivity in Glial Cell Lineages Correlate with =
Differential=20
      Response of Oligodendrogliomas and Astrocytomas to=20
      Chemotherapy</STRONG><BR>Cancer Res., September&nbsp;1,&nbsp;2000; =
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">[Abstract]</A>=20
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/A>=20
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        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_01C85874.E6E50B00
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://www.pnas.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=
          e.style.borderRightColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right-style") {=0A=
          e.style.borderRightStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right-width") {=0A=
          e.style.borderRightWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-style") {=0A=
          e.style.borderStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top") {=0A=
          e.style.borderTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top-color") {=0A=
          e.style.borderTopColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top-style") {=0A=
          e.style.borderTopStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top-width") {=0A=
          e.style.borderTopWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-width") {=0A=
          e.style.borderWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "bottom") {=0A=
          e.style.bottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "clear") {=0A=
          e.style.clear =3D value;=0A=
        }=0A=
        else if (name =3D=3D "clip") {=0A=
          e.style.clip =3D value;=0A=
        }=0A=
        else if (name =3D=3D "color") {=0A=
          e.style.color =3D value;=0A=
        }=0A=
        else if (name =3D=3D "cssText") {=0A=
          e.style.Sets =3D value;=0A=
        }=0A=
        else if (name =3D=3D "cursor") {=0A=
          e.style.cursor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "direction") {=0A=
          e.style.direction =3D value;=0A=
        }=0A=
        else if (name =3D=3D "display") {=0A=
          e.style.display =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font") {=0A=
          e.style.font =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-family") {=0A=
          e.style.fontFamily =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-size") {=0A=
          e.style.fontSize =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-style") {=0A=
          e.style.fontStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-variant") {=0A=
          e.style.fontVariant =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-weight") {=0A=
          e.style.fontWeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "height") {=0A=
          e.style.height =3D value;=0A=
        }=0A=
        else if (name =3D=3D "ime-mode") {=0A=
          e.style.imeMode =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-flow") {=0A=
          e.style.layoutFlow =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid") {=0A=
          e.style.layoutGrid =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid-char") {=0A=
          e.style.layoutGridChar =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid-line") {=0A=
          e.style.layoutGridLine =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid-mode") {=0A=
          e.style.layoutGridMode =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid-type") {=0A=
          e.style.layoutGridType =3D value;=0A=
        }=0A=
        else if (name =3D=3D "left") {=0A=
          e.style.left =3D value;=0A=
        }=0A=
        else if (name =3D=3D "letter-spacing") {=0A=
          e.style.letterSpacing =3D value;=0A=
        }=0A=
        else if (name =3D=3D "line-break") {=0A=
          e.style.lineBreak =3D value;=0A=
        }=0A=
        else if (name =3D=3D "line-height") {=0A=
          e.style.lineHeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "list-style") {=0A=
          e.style.listStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "list-style-image") {=0A=
          e.style.listStyleImage =3D value;=0A=
        }=0A=
        else if (name =3D=3D "list-style-position") {=0A=
          e.style.listStylePosition =3D value;=0A=
        }=0A=
        else if (name =3D=3D "list-style-type") {=0A=
          e.style.listStyleType =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin") {=0A=
          e.style.margin =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin-bottom") {=0A=
          e.style.marginBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin-left") {=0A=
          e.style.marginLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin-right") {=0A=
          e.style.marginRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin-top") {=0A=
          e.style.marginTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "min-height") {=0A=
          e.style.minHeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "overflow") {=0A=
          e.style.overflow =3D value;=0A=
        }=0A=
        else if (name =3D=3D "overflow-x") {=0A=
          e.style.overflowX =3D value;=0A=
        }=0A=
        else if (name =3D=3D "overflow-y") {=0A=
          e.style.overflowY =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding") {=0A=
          e.style.padding =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding-bottom") {=0A=
          e.style.paddingBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding-left") {=0A=
          e.style.paddingLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding-right") {=0A=
          e.style.paddingRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding-top") {=0A=
          e.style.paddingTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "page-break-after") {=0A=
          e.style.pageBreakAfter =3D value;=0A=
        }=0A=
        else if (name =3D=3D "page-break-before") {=0A=
          e.style.pageBreakBefore =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelBottom") {=0A=
          e.style.pixelBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelHeight") {=0A=
          e.style.pixelHeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelLeft") {=0A=
          e.style.pixelLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelRight") {=0A=
          e.style.pixelRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelTop") {=0A=
          e.style.pixelTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelWidth") {=0A=
          e.style.pixelWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posBottom") {=0A=
          e.style.posBottom =3D value;=0A=
        }=0A=
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          e.style.position =3D value;=0A=
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          e.style.posWidth =3D value;=0A=
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          e.style.right =3D value;=0A=
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          e.style.rubyOverhang =3D value;=0A=
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          e.style.scrollbarArrowColor =3D value;=0A=
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          e.style.scrollbarBaseColor =3D value;=0A=
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          e.style.scrollbarFaceColor =3D value;=0A=
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          e.style.scrollbarHighlightColor =3D value;=0A=
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          e.style.scrollbarShadowColor =3D value;=0A=
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          e.style.scrollbarTrackColor =3D value;=0A=
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          e.style.tableLayout =3D value;=0A=
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          e.style.textAlign =3D value;=0A=
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          e.style.textAutospace =3D value;=0A=
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          e.style.textDecoration =3D value;=0A=
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          e.style.textDecorationOverline =3D value;=0A=
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          e.style.textJustify =3D value;=0A=
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          e.style.textKashidaSpace =3D value;=0A=
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          e.style.textOverflow =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-transform") {=0A=
          e.style.textTransform =3D value;=0A=
        }=0A=
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          e.style.textUnderlinePosition =3D value;=0A=
        }=0A=
        else if (name =3D=3D "top") {=0A=
          e.style.top =3D value;=0A=
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          e.style.unicodeBidi =3D value;=0A=
        }=0A=
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          e.style.verticalAlign =3D value;=0A=
        }=0A=
        else if (name =3D=3D "visibility") {=0A=
          e.style.visibility =3D value;=0A=
        }=0A=
        else if (name =3D=3D "white-space") {=0A=
          e.style.whiteSpace =3D value;=0A=
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          e.style.width =3D value;=0A=
        }=0A=
        else if (name =3D=3D "word-break") {=0A=
          e.style.wordBreak =3D value;=0A=
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          e.style.wordSpacing =3D value;=0A=
        }=0A=
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          e.style.wordWrap =3D value;=0A=
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          e.style.writingMode =3D value;=0A=
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          e.style.zIndex =3D value;=0A=
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          e.style.zoom =3D value;=0A=
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      }=0A=
      catch (e) {=0A=
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    }=0A=
  }=0A=
}=0A=

------=_NextPart_000_0000_01C85874.E6E50B00
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://www.pnas.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=
    if (req.readyState =3D=3D 4 && (req.status =3D=3D 200 || req.status =
=3D=3D 304)) {=0A=
      var src =3D req.responseXML.documentElement;=0A=
      var dst =3D document.createDocumentFragment();=0A=
      for (var i =3D 0; i < src.childNodes.length; i++) {=0A=
      	copy_xml_to_html(src.childNodes[i], dst);=0A=
      }=0A=
      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_01C85874.E6E50B00
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=
 if (_uff && (!page || page=3D=3D"")) return;=0A=
 var a,b,c,xx,v,z,k,x=3D"",s=3D"",f=3D0;=0A=
 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=
 } else if (f=3D=3D2) {=0A=
  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=
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 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=
   =
i2[ii].src=3D_ugifpath2+"?"+"utmwv=3D"+_uwv+s+"&utmac=3D"+_uacct+"&utmcc=3D=
"+c;=0A=
   i2[ii].onload=3Dfunction() { _uVoid(); }=0A=
  }=0A=
 }=0A=
 return;=0A=
}=0A=
function _uFlash() {=0A=
 var f=3D"-",n=3Dnavigator;=0A=
 if (n.plugins && n.plugins.length) {=0A=
  for (var ii=3D0;ii<n.plugins.length;ii++) {=0A=
   if (n.plugins[ii].name.indexOf('Shockwave Flash')!=3D-1) {=0A=
    f=3Dn.plugins[ii].description.split('Shockwave Flash ')[1];=0A=
    break;=0A=
   }=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=
    if (fl) { f=3Dii + '.0'; break; }=0A=
   }=0A=
   catch(e) {}=0A=
  }=0A=
 }=0A=
 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=
  }=0A=
 } 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=
   else =
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=
 }=0A=
 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=
  }=0A=
  _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=
  return decodeURIComponent(s);=0A=
 } 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=
  t=3D" expires=3D";=0A=
  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=
 } else {=0A=
  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=
 } else if (window.attachEvent) { =0A=
  window.attachEvent('onload', _uCO);=0A=
 }=0A=
}=0A=
=0A=
function _uNx() {=0A=
  return (new Date((new Date()).getTime()+63072000000)).toGMTString();=0A=
}=0A=

------=_NextPart_000_0000_01C85874.E6E50B00--

