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Subject: Normal Stem Cells and Cancer Stem Cells: The Niche Matters -- Li and Neaves 66 (9): 4553 -- Cancer Research
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size=3D-1>[<EM>Cancer Research</EM> 66, 4553-4557, May 1, 2006]<BR>=A9 =
2006 <A=20
href=3D"http://cancerres.aacrjournals.org/misc/terms.shtml">American =
Association=20
for Cancer Research</A> </FONT><BR>
<TABLE cellSpacing=3D0 cellPadding=3D0>
  <TBODY>
  <TR>
    <TD>
      <HR noShade SIZE=3D1>

      <H3>Reviews</H3></TD></TR></TBODY></TABLE>
<H2>Normal Stem Cells and Cancer Stem Cells: The Niche Matters=20
</H2><STRONG></NOBR><NOBR>Linheng Li<SUP>1</SUP><SUP>,3</SUP></NOBR> and =

<NOBR>William B. Neaves<SUP>1</SUP><SUP>,2</SUP></NOBR> </STRONG>
<P><FONT size=3D-1><SUP>1</SUP> Stowers Institute for Medical Research =
and=20
<SUP>2</SUP> University of Missouri-Kansas City School of Medicine, =
Kansas City,=20
Missouri and <SUP>3</SUP> University of Kansas Medical Center, Kansas =
City,=20
Kansas </FONT>
<P><FONT size=3D-1><B>Requests for reprints:</B> Linheng Li, Stowers =
Institute for=20
Medical Research, Kansas City, MO. E-mail: <SPAN=20
id=3Dem0>lil{at}stowers-institute.org</SPAN>
<SCRIPT type=3Dtext/javascript><!--=0A=
 var u =3D "lil", d =3D "stowers-institute.org"; =
document.getElementById("em0").innerHTML =3D '<a href=3D"mailto:' + u + =
'@' + d + '">' + u + '@' + d + '<\/a>'//--></SCRIPT>
.</FONT>
<P>
<P><A name=3DABS><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Abstract </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#top"=
><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Abstract</FONT><BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC1=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Is Cancer a Disease...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC2=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Homeostatic Regulation of Stem...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC3=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Stem Cell Niche: Gatekeeper...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC4=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Link between Stem Cell...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC5=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Closing Remarks<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#BIBL=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>S=
cientists=20
have tried for decades to understand cancer development<SUP> </SUP>in =
the=20
context of therapeutic strategies. The realization that<SUP> =
</SUP>cancers may=20
rely on "cancer stem cells" that share the self-renewal<SUP> =
</SUP>feature of=20
normal stem cells has changed the perspective with<SUP> </SUP>regard to =
new=20
approaches for treating the disease. In this review,<SUP> </SUP>we =
propose that=20
one of the differences between normal stem cells<SUP> </SUP>and cancer =
stem=20
cells is their degree of dependence on the stem<SUP> </SUP>cell niche, a =

specialized microenvironment in which stem cells<SUP> </SUP>reside. The =
stem=20
cell niche in adult somatic tissues plays an<SUP> </SUP>essential role =
in=20
maintaining stem cells or preventing tumorigenesis<SUP> </SUP>by =
providing=20
primarily inhibitory signals for both proliferation<SUP> </SUP>and=20
differentiation. However, the niche also provides transient<SUP> =
</SUP>signals=20
for stem cell division to support ongoing tissue regeneration.<SUP> =
</SUP>The=20
balance between proliferation-inhibiting and =
proliferation-promoting<SUP>=20
</SUP>signals is the key to homeostatic regulation of stem cell =
maintenance<SUP>=20
</SUP>versus tissue regeneration. Loss of the niche can lead to =
loss<SUP>=20
</SUP>of stem cells, indicating the reliance of stem cells on niche<SUP> =

</SUP>signals. Therefore, cancer stem cells may arise from an =
intrinsic<SUP>=20
</SUP>mutation, leading to self-sufficient cell proliferation, =
and/or<SUP>=20
</SUP>may also involve deregulation or alteration of the niche by<SUP>=20
</SUP>dominant proliferation-promoting signals. Furthermore, the =
molecular<SUP>=20
</SUP>machinery used by normal stem cells for homing to or =
mobilizing<SUP>=20
</SUP>from the niche may be "hijacked" by cancer stem cells for =
invasion<SUP>=20
</SUP>and metastasis. We hope this examination of the interaction<SUP>=20
</SUP>between stem cells and their niche will enhance understanding<SUP> =

</SUP>of the process of cancer development, invasiveness, and =
metastasis<SUP>=20
</SUP>and reveal possible targets for cancer treatment. (Cancer Res<SUP> =

</SUP>2006; 66(9): 4553-7)<SUP> </SUP>
<P><A name=3DSEC1><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp; Is=20
      Cancer a Disease of Stem Cells? </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#top"=
><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#ABS"=
><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Is Cancer a =
Disease...</FONT><BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC2=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Homeostatic Regulation of Stem...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC3=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Stem Cell Niche: Gatekeeper...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC4=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Link between Stem Cell...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC5=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Closing Remarks<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#BIBL=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>I=
n recent=20
decades, biomedical research has revealed extraordinary<SUP> =
</SUP>diversity=20
within the broad category of diseases known as cancers.<SUP> </SUP>This=20
astounding variety confounds attempts to find common features<SUP> =
</SUP>among=20
the many forms of cancer. However, all clinically significant<SUP> =
</SUP>cancers=20
share at least one common characteristic: excessive<SUP> =
</SUP>proliferation of=20
affected cells. As highly differentiated cells<SUP> </SUP>rarely divide, =
and=20
rapidly proliferating cells have poorly differentiated<SUP> =
</SUP>phenotypes,=20
two basic therapeutic approaches for combating cancers<SUP> </SUP>have=20
developed: "differentiation therapy" (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B1">=
1</A>) to=20
induce differentiation<SUP> </SUP>and "destruction therapy" (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B2">=
2</A>) to=20
thwart malignant proliferation.<SUP> </SUP>Apart from limited success in =
some=20
cases, neither of these approaches<SUP> </SUP>completely cures =
cancer.<SUP>=20
</SUP>
<P>In the early 1990s, clinical observations and genetic studies<SUP> =
</SUP>of a=20
variety of cancers led to the hypothesis that six genetic<SUP> =
</SUP>mutations=20
were required to convert a normal somatic cell into<SUP> </SUP>a cancer =
cell (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B3">=
3</A>, <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B4">=
4</A>).=20
These six mutations included (<I>a</I>) self-sufficiency<SUP> </SUP>for =
growth=20
signals, (<I>b</I>) insensitivity to antigrowth signals,<SUP> =
</SUP>(<I>c</I>)=20
evasion of apoptosis, (<I>d</I>) limitless ability to replicate,<SUP>=20
</SUP>(<I>e</I>) sustained angiogenesis, and (<I>f</I>) tissue invasion =
and=20
metastasis.<SUP> </SUP>
<P>However, not all cells in a given tissue are created equally<SUP> =
</SUP>in=20
terms of their stage of development and their potential for<SUP>=20
</SUP>proliferation and/or differentiation. Stem cells sit at the<SUP> =
</SUP>top=20
of the developmental hierarchy, having the ability to self-renew<SUP> =
</SUP>and=20
give rise to all the cell lineages in corresponding tissues.<SUP> =
</SUP>Stem=20
cells divide to produce two daughter cells. One daughter<SUP> =
</SUP>remains a=20
stem cell (self-renewal). The other daughter becomes<SUP> </SUP>a =
progenitor=20
cell that undergoes expansion and further differentiation<SUP> =
</SUP>into mature=20
cells. Stem cells have the highest potential for<SUP> =
</SUP>proliferation and a=20
much longer life span compared with their<SUP> </SUP>progeny and =
therefore have=20
a greater opportunity to accumulate<SUP> </SUP>genetic mutations (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B5">=
5</A>).=20
The realization that the adult body harbors<SUP> </SUP>small numbers of =
stem=20
cells offered an alternative possibility<SUP> </SUP>for the origin of =
cancer.=20
Perhaps only one or two mutations,<SUP> </SUP>such as self-sufficiency =
in growth=20
or insensitivity to antigrowth<SUP> </SUP>signals, are needed for stem =
cells to=20
initiate tumorigenesis<SUP> </SUP>rather than six mutations, a rare =
event in any=20
type of cell.<SUP> </SUP>
<P>The thought that cancer might originate in stem cells harkens<SUP> =
</SUP>back=20
to the 19th century concept of "embryonal rest" (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B6">=
6</A>, <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B7">=
7</A>).<SUP>=20
</SUP>Over a century later, one recognizes the similarity between<SUP> =
</SUP>the=20
old belief that cancer arises from embryonal rests and the<SUP>=20
</SUP>contemporary view that some forms of cancer originate in =
adult<SUP>=20
</SUP>stem cells. In 1994, John Dick's lab showed that =
leukemia-initiating<SUP>=20
</SUP>stem cells present in the peripheral blood of acute =
myelogenous<SUP>=20
</SUP>leukemia (AML) patients (1 of 250,000 cells) could induce AML<SUP> =

</SUP>when transplanted into severe combined immunodeficient (SCID)<SUP> =

</SUP>mice (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B8">=
8</A>).=20
Demonstration of tumorigenesis in SCID mice became<SUP> </SUP>convincing =
proof=20
of the role of stem cells in perpetuating cancer<SUP> </SUP>in various =
organs.=20
In 2003, Michael Clarke's lab conclusively<SUP> </SUP>showed the =
presence of=20
stem cells in breast cancer (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B9">=
9</A>).=20
The<SUP> </SUP>following year, Peter Dirks' lab unequivocally proved =
stem=20
cell<SUP> </SUP>involvement in brain cancer (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B10"=
>10</A>).<SUP>=20
</SUP>
<P>Within established tumors, the great majority of the cancer<SUP> =
</SUP>cells=20
cannot sustain the lesion nor establish it elsewhere in<SUP> </SUP>the =
body.=20
Only a few cells within the tumor, the cancer stem<SUP> </SUP>cells, are =

tumorigenic and possess the metastatic phenotype<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B5">=
5</A>).=20
This circumstance has implications for both therapy and<SUP> =
</SUP>research (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B11"=
>11</A>).=20
It explains why treatments that substantially<SUP> </SUP>reduce the =
tumor mass=20
by removing proliferating cells fail to<SUP> </SUP>cure patients with =
some types=20
of cancer, because cancer stem<SUP> </SUP>cells are usually slowly =
cycling cells=20
and thus insensitive<SUP> </SUP>to these treatments. It also introduces =
a note=20
of caution among<SUP> </SUP>researchers seeking insight from analysis of =
a=20
cross-section<SUP> </SUP>of the tumor cell population. Gene expression =
profiles=20
obtained<SUP> </SUP>from samples of heterogeneous tumor tissue probably =
bear=20
limited<SUP> </SUP>resemblance to those of the tumor stem cell =
population,=20
which<SUP> </SUP>forms only a tiny fraction of the whole tumor (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B12"=
>12</A>).<SUP>=20
</SUP>
<P>Anyone tempted to embrace the stem cell genesis of cancer too<SUP>=20
</SUP>warmly should remember the accumulated frustrations of the=20
two-century-long<SUP> </SUP>quest to find a unifying theory of how =
malignant=20
tumors arise.<SUP> </SUP>Stem cell biology clearly holds critical =
insight for=20
understanding<SUP> </SUP>and defeating many kinds of cancer, but not all =
cancers=20
come<SUP> </SUP>from populations of self-renewing stem cells. Some forms =
of<SUP>=20
</SUP>leukemia clearly come from true stem cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B13"=
>13</A>),=20
but cancer<SUP> </SUP>can also arise from progenitor cells downstream of =
stem=20
cells.<SUP> </SUP>For example, Weissman's lab recently found that a =
mutation=20
that<SUP> </SUP>enhances nuclear =DF-catenin in =
granulocyte-macrophage<SUP>=20
</SUP>progenitor cells causes a blast crisis in some patients with<SUP>=20
</SUP>chronic myeloid leukemia (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B14"=
>14</A>).=20
It seems these mutated progenitor<SUP> </SUP>cells have acquired the =
ability to=20
self-renew, a feature thought<SUP> </SUP>to be specific to stem cells, =
and to=20
undergo unlimited growth<SUP> </SUP>as cancer cells. In this sense, =
cancer may=20
prove to be more<SUP> </SUP>of a stem cell disease than previously =
suspected (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B13"=
>13</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B15"=
>15</A>).=20
This<SUP> </SUP>concept has immediately changed the perspective of the=20
cancer<SUP> </SUP>field and shed light on new strategies for therapeutic =

treatment<SUP> </SUP>of cancers.<SUP> </SUP>
<P><A name=3DSEC2><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Homeostatic Regulation of Stem Cells by the Niche: a Balance =
between=20
      Self-renewal and Differentiation </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#top"=
><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#ABS"=
><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC1=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Is Cancer a Disease...<BR></A><IMG height=3D9 alt=3D" " =
hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Homeostatic Regulation of=20
      Stem...</FONT><BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC3=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Stem Cell Niche: Gatekeeper...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC4=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Link between Stem Cell...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC5=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Closing Remarks<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#BIBL=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>I=
n adults,=20
stem cells reside in a physiologically limited and<SUP> =
</SUP>specialized=20
microenvironment, or niche, that supports stem cells<SUP> </SUP>but =
varies in=20
nature and location depending on the tissue type<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B16"=
>16</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B17"=
>17</A>).=20
Remarkable progress has been made in studies regarding<SUP> </SUP>the=20
interaction between stem cells and their surrounding =
microenvironment<SUP>=20
</SUP>in flies, <I>Caenorhabditis elegans,</I> and mammals. By =
comparing<SUP>=20
</SUP>the stem cell niches in these systems, features and functions<SUP> =

</SUP>common to all stem cell niches have emerged as follows (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B17"=
>17</A>=96<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B19"=
>19</A>):
<UL>
  <LI>The<SUP> </SUP>stem cell niche is composed of a group of cells in =
a=20
  special<SUP> </SUP>location that functions to maintain stem =
cells.<SUP>=20
  </SUP><BR>
  <LI>The niche<SUP> </SUP>is a physical anchoring site for stem cells, =
and=20
  adhesion<SUP> </SUP>molecules<SUP> </SUP>are involved in the =
interaction=20
  between stem cells<SUP> </SUP>and the niche<SUP> </SUP>and between =
stem cells=20
  and the extracellular matrix.<SUP> </SUP><BR>
  <LI>The niche<SUP> </SUP>generates extrinsic factors that control stem =

  cell<SUP> </SUP>number, proliferation,<SUP> </SUP>and fate =
determination. Many=20
  developmental<SUP> </SUP>regulatory signal<SUP> </SUP>molecules, =
including hh,=20
  Wnts, bone morphogenetic<SUP> </SUP>proteins (BMP),<SUP> =
</SUP>fibroblast=20
  growth factors, and Notch, have been<SUP> </SUP>shown to play<SUP> =
</SUP>roles=20
  in controlling stem cell self-renewal and<SUP> </SUP>in =
regulating<SUP>=20
  </SUP>lineage fate in different systems.<SUP> </SUP><BR>
  <LI>The niche controls normal<SUP> </SUP>asymmetrical division of stem =

  cells.<SUP> </SUP>This has been shown in<SUP> </SUP>invertebrates; =
whether it=20
  is conserved<SUP> </SUP>in the mammalian system<SUP> </SUP>is still an =
open=20
  question.<SUP> </SUP><BR></LI></UL><SUP></SUP>
<P>Normally, at least in the hematopoietic, intestinal, and hair<SUP>=20
</SUP>follicle systems, the niche maintains stem cells primarily in<SUP> =
</SUP>a=20
quiescent state by providing signals that inhibit cell =
proliferation<SUP>=20
</SUP>and growth as evidenced by the ability of stem cells to =
retain<SUP>=20
</SUP>bromodeoxyuridine labeling for a relatively long period of =
time<SUP>=20
</SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B20"=
>20</A>=96<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B24"=
>24</A>).=20
Only upon receipt of a stimulating signal does<SUP> </SUP>the stem cell =
become=20
activated to divide and proliferate (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#FIG1=
">Fig.=20
1</A> ).<SUP> </SUP>Therefore, stem cell proliferation depends on =
dynamic=20
niche<SUP> </SUP>signaling. Maintaining a balance between the =
proliferation=20
signal<SUP> </SUP>and antiproliferation signal is the key to homeostatic =

regulation<SUP> </SUP>of stem cells, allowing stem cells to undergo =
self-renewal=20
while<SUP> </SUP>supporting ongoing tissue regeneration (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B25"=
>25</A>).=20
Any genetic mutation<SUP> </SUP>that leads stem cells to become =
independent of=20
growth signals,<SUP> </SUP>or to resist antigrowth signals, will cause =
the stem=20
cells to<SUP> </SUP>undergo uncontrolled proliferation and possible=20
tumorigenesis<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#FIG1=
">Fig.=20
1</A>). In this review, we will use recent studies of signaling<SUP>=20
</SUP>regulation of stem cells in bone marrow, intestine, and skin<SUP> =
</SUP>to=20
show the importance of this balanced control of stem cells<SUP> </SUP>by =
both=20
growth-promoting and growth-inhibiting signals.<SUP> </SUP>
<P><A name=3DFIG1><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553/FIG1=
"><IMG=20
            height=3D137 alt=3D"Figure 1" hspace=3D10=20
            =
src=3D"http://cancerres.aacrjournals.org/content/vol66/issue9/images/smal=
l/4553fig01c.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (48K):<BR><NOBR><A=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553/FIG1=
">[in=20
            this window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG1', 590, 501); =
this.href=3D'/cgi/content-nw/full/66/9/4553/FIG1'"=20
            =
href=3D"http://cancerres.aacrjournals.org/cgi/content-nw/full/66/9/4553/F=
IG1"=20
            target=3DFIG1>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><B>Figure 1.</B> Comparison of =
the niches=20
            under normal and cancerous conditions. The stem cell niche =
under=20
            normal physiological conditions provides an environment that =

            predominantly inhibits both proliferation and =
differentiation.=20
            However, a transient proliferating signal is required to =
support=20
            ongoing tissue regeneration. In cancer or tumors, owing to =
internal=20
            mutations, cancer stem cells become self-sufficient to =
undergo=20
            uncontrolled proliferation or, due to changes in the per se =
or a=20
            change in the niche signals, the niche is converted into an=20
            environment with dominant signals favoring cell =
proliferation and=20
            growth. In some cases, a combination of these scenarios may =
be=20
            required. In addition, uncontrolled proliferation of =
stem/progenitor=20
            cells leads to expansion of the progenitor pool, which is =
poised to=20
            accumulate a secondary genetic mutation.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER>&nbsp=
;<BR>In=20
adults, hematopoiesis occurs in bone marrow in which hematopoietic<SUP>=20
</SUP>stem cells (HSC) are primarily located in the osteoblastic =
niche<SUP>=20
</SUP>on the bone surface (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B21"=
>21</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B22"=
>22</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B26"=
>26</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B27"=
>27</A>).=20
Upon mobilization, HSCs<SUP> </SUP>and their progenitor cells are found =
adjacent=20
to the sinusoid<SUP> </SUP>endothelial cells (vascular niche; refs. <A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B28"=
>28</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B29"=
>29</A>).=20
It has been<SUP> </SUP>proposed that a gradient of osteoblastic niche to =

vascular niche<SUP> </SUP>exists in bone marrow, with the osteoblastic =
niche=20
providing<SUP> </SUP>a quiescent microenvironment, and the vascular =
niche=20
favoring<SUP> </SUP>for proliferation and further differentiation (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B30"=
>30</A>).<SUP>=20
</SUP>
<P>In skin, stem cells are located in the bulge area of the hair<SUP>=20
</SUP>follicle (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B24"=
>24</A>).=20
Wnt signaling has been reported to play a role<SUP> </SUP>in promoting =
stem cell=20
activation and expansion in skin (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B31"=
>31</A>,<SUP>=20
</SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B32"=
>32</A>).=20
However, Wnt inhibitors, including Dkk, sFRP, and Wif,<SUP> </SUP>have =
been=20
found to be dominantly present in the stem cell niche<SUP> </SUP>in the =
hair=20
follicle bulge, providing an environment of cell<SUP> </SUP>growth =
inhibition=20
(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B20"=
>20</A>).=20
The Wnt molecules are primarily expressed<SUP> </SUP>in dermal papilla, =
separate=20
from the bulge region, and only<SUP> </SUP>when the bulge area is close =
to the=20
dermal papilla during the<SUP> </SUP>early anagen phase can stem cells =
be=20
activated in response to<SUP> </SUP>Wnt signals emanating from the =
dermal=20
papilla (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B33"=
>33</A>).=20
Likewise,<SUP> </SUP>Wnt signaling can also promote HSC proliferation =
(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B34"=
>34</A>),=20
but which<SUP> </SUP>Wnt signal, if any, is expressed in the =
osteoblastic or=20
vascular<SUP> </SUP>niche is thus far unknown.<SUP> </SUP>
<P>In intestine, intestinal stem cells (ISC) are located between<SUP>=20
</SUP>differentiated Paneth cells and proliferating progenitor =
cells<SUP>=20
</SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B35"=
>35</A>=96<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B37"=
>37</A>).=20
Wnt signaling is known to promote crypt cell<SUP> </SUP>proliferation =
(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B38"=
>38</A>);=20
however, sFRP5, a Wnt inhibitor, has also<SUP> </SUP>been shown to be=20
predominantly expressed in ISCs (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B39"=
>39</A>).=20
In contrast,<SUP> </SUP>active Wnt signaling is widely seen in the =
proliferating=20
crypt<SUP> </SUP>cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B37"=
>37</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B38"=
>38</A>).=20
Overall, Wnt signaling is most likely only transiently<SUP> </SUP>active =
in the=20
ISC niche (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B25"=
>25</A>).<SUP>=20
</SUP>
<P>On the other hand, signals, including transforming growth =
factor-=DF<SUP>=20
</SUP>(TGF-=DF) and BMP, provide proliferation-inhibition<SUP> =
</SUP>signals to=20
inhibit stem cell activation and proliferation (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B37"=
>37</A>,<SUP>=20
</SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B40"=
>40</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B41"=
>41</A>),=20
but whether they are expressed in each or all of the<SUP> </SUP>niches =
described=20
above is not clear, apart from BMP4, which<SUP> </SUP>has been shown to =
be=20
expressed in the intestinal stem cell niche<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B37"=
>37</A>).<SUP>=20
</SUP>
<P>Wnt signaling, known to promote cell growth (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B42"=
>42</A>),=20
is activated<SUP> </SUP>when Wnt binds its receptor Frizzled and sends a =
signal=20
to inhibit<SUP> </SUP>a negative complex formed by adenomatous polyposis =
coli=20
(APC)<SUP> </SUP>and glycogen synthase kinase-3=DF, which controls =
the<SUP>=20
</SUP>phosphorylation and subsequent degradation of =DF-catenin.<SUP>=20
</SUP>Abnormal activation of the Wnt signaling pathway causes cells<SUP> =

</SUP>to receive a continuous signal for proliferation due to =
accumulation<SUP>=20
</SUP>of =DF-catenin in the nuclei, thereby leading to the<SUP> =
</SUP>development=20
of APC in intestine, hair follicle tumors in skin,<SUP> </SUP>and =
leukemia in=20
bone marrow (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B14"=
>14</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B43"=
>43</A>=96<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B45"=
>45</A>).<SUP>=20
</SUP>
<P>BMPs belong to the TGF-=DF super family, which in general<SUP> =
</SUP>inhibits=20
cell growth with exceptions in some systems (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B40"=
>40</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B46"=
>46</A>,<SUP>=20
</SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B47"=
>47</A>).=20
BMP2/BMP4 signaling is mediated by Bmpr1A or Bmpr1B (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B46"=
>46</A>)<SUP>=20
</SUP>and through Smad transcriptional factors 1, 5, or 8 together<SUP>=20
</SUP>with Smad4 and regulates targeted gene expression (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B48"=
>48</A>).=20
BMP<SUP> </SUP>activity can be regulated by its antagonists, such as =
Noggin<SUP>=20
</SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B49"=
>49</A>).=20
In a mouse model in which BMPR1a was conditionally inactivated,<SUP> =
</SUP>the=20
stem cell populations were expanded in hair follicle, intestine,<SUP> =
</SUP>and=20
bone marrow, resulting in hair follicle tumors (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B50"=
>50</A>),=20
intestinal<SUP> </SUP>polyposis (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B37"=
>37</A>),=20
and abnormal bone growth and expansion of the<SUP> </SUP>HSC population, =

respectively (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B21"=
>21</A>).=20
These observations have shown<SUP> </SUP>that BMP signaling mediated by =
Bmpr1a=20
directly inhibits stem<SUP> </SUP>cell proliferation in the niches of =
intestine=20
and skin and indirectly<SUP> </SUP>regulates hematopoietic stem cells =
through=20
control of its niche.<SUP> </SUP>Although BMP4 is constantly expressed =
in the=20
ISC niche, its<SUP> </SUP>antagonist Noggin is transiently expressed in =
stem=20
cells of<SUP> </SUP>the intestines and the hair follicle bulge area (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B37"=
>37</A>).<A=20
name=3DRFN1></A><SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#FN1"=
>4</A></SUP>=20
It has<SUP> </SUP>been proposed that coordination between Wnt and the=20
transiently<SUP> </SUP>expressed Noggin, which overrides BMP inhibition=20
signaling,<SUP> </SUP>is required to activate stem cells, at least in =
skin and=20
intestine<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B25"=
>25</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B51"=
>51</A>).=20
The fact that overexpression of Noggin leads to intestinal<SUP> =
</SUP>polyposis=20
supports this model (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B52"=
>52</A>).<SUP>=20
</SUP>
<P>In summary, the interplay between the BMP antigrowth signal<SUP> =
</SUP>and=20
the Wnt growth-promoting signal regulates the homeostatic<SUP> =
</SUP>balance of=20
stem cell self-renewal and ongoing regeneration.<SUP> </SUP>If this =
balance is=20
disrupted, stem cells may proliferate without<SUP> </SUP>restraint, such =
as when=20
loss of BMP signaling or abnormal activation<SUP> </SUP>of Wnt signaling =
leads=20
to tumorigenesis (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B14"=
>14</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B37"=
>37</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B45"=
>45</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B52"=
>52</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B53"=
>53</A>).<SUP>=20
</SUP>
<P><A name=3DSEC3><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp; Stem=20
      Cell Niche: Gatekeeper of Pandora's Box =
</FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#top"=
><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#ABS"=
><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC1=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Is Cancer a Disease...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC2=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Homeostatic Regulation of Stem...<BR></A><IMG =
height=3D9 alt=3D" "=20
      hspace=3D5 =
src=3D"http://cancerres.aacrjournals.org/icons/toc/dot.gif"=20
      width=3D11 border=3D0><FONT color=3D#464c53>Stem Cell Niche:=20
      Gatekeeper...</FONT><BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC4=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Link between Stem Cell...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC5=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Closing Remarks<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#BIBL=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>T=
he role=20
of the niche in maintaining stem cells has been shown<SUP> </SUP>in =
several=20
systems. For example, genetic ablation of the germ<SUP> </SUP>line stem =
cell=20
niche in flies results in loss of stem cells<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B54"=
>54</A>).=20
Increasing the niche size in mice leads to an increased<SUP> =
</SUP>number of=20
hematopoietic stem cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B21"=
>21</A>),=20
and in contrast, depleting<SUP> </SUP>the osteoblastic lining cells =
leads to=20
depletion of hematopoietic<SUP> </SUP>tissue (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B55"=
>55</A>).=20
However, recent evidence has suggested that the<SUP> </SUP>stem cell =
niche may=20
have another important function that has<SUP> </SUP>thus far been=20
underestimated. That function is to prevent tumorigenesis<SUP> </SUP>by=20
controlling stem cell proliferation. Here, we hypothesize<SUP> =
</SUP>that=20
deregulation of the niche leading to uncontrolled proliferation<SUP> =
</SUP>of=20
stem cells may result in tumorigenesis (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#FIG1=
">Fig.=20
1</A>), much like<SUP> </SUP>opening "Pandora's box." Recently, R. =
Dickson's lab=20
reported<SUP> </SUP>that deregulation in the mammary gland stem cell =
niche=20
leads<SUP> </SUP>to abnormal expression of TFF<IMG alt=3D{alpha}=20
src=3D"http://cancerres.aacrjournals.org/math/alpha.gif" border=3D0>, =
resulting in=20
the development<SUP> </SUP>of breast cancer (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B56"=
>56</A>),=20
and this seems to support our hypothesis.<SUP> </SUP>
<P><A name=3DSEC4><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp; Link=20
      between Stem Cell Homing/Mobilization and Cancer Cell =
Invasion/Metastasis=20
      </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#top"=
><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#ABS"=
><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC1=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Is Cancer a Disease...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC2=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Homeostatic Regulation of Stem...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC3=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Stem Cell Niche: Gatekeeper...<BR></A><IMG height=3D9 =
alt=3D" "=20
      hspace=3D5 =
src=3D"http://cancerres.aacrjournals.org/icons/toc/dot.gif"=20
      width=3D11 border=3D0><FONT color=3D#464c53>Link between Stem=20
      Cell...</FONT><BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC5=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      border=3D0>Closing Remarks<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#BIBL=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>A=
 basic=20
function of the niche is to anchor stem cells in the<SUP> =
</SUP>appropriate=20
microenvironment. This function is mediated by adhesion<SUP> =
</SUP>molecules,=20
including an adherent complex composed of cadherin<SUP> </SUP>and =
=DF-catenin. It=20
has been reported that different<SUP> </SUP>forms of =DF-catenin =
interact with=20
different protein<SUP> </SUP>complexes. That is, the heterodimeric form =
of=20
=DF-catenin/<IMG alt=3D{alpha}=20
src=3D"http://cancerres.aacrjournals.org/math/alpha.gif" =
border=3D0>-catenin<SUP>=20
</SUP>interacts with membrane-bound cadherin, and the monomer form<SUP>=20
</SUP>interacts with Tcf in nuclei, and that the phosphorylation of<SUP> =

</SUP>the COOH terminus of =DF-catenin (by non-Wnt signals)<SUP> =
</SUP>regulates=20
the conversion between the two forms (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B57"=
>57</A>).=20
It is,<SUP> </SUP>therefore, reasonable to propose that =DF-catenin =
is<SUP>=20
</SUP>a key molecule bridging two states of stem cells (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B58"=
>58</A>):=20
the arrested<SUP> </SUP>state when stem cells are attached to the niche =
through=20
the<SUP> </SUP>cadherin-=DF-catenin adhesion interaction (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B21"=
>21</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B59"=
>59</A>)=20
and<SUP> </SUP>the activated state in which =DF-catenin is =
nuclearly<SUP>=20
</SUP>localized (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B31"=
>31</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B37"=
>37</A>).=20
Defining the signals that regulate the conformational<SUP> </SUP>change =
of=20
=DF-catenin through phosphorylation of its<SUP> </SUP>COOH terminus to =
control the=20
conversion of =DF-catenin<SUP> </SUP>from its membrane-bound form to the =
form=20
favoring Tcf binding<SUP> </SUP>will provide insight into understanding =
stem=20
cell activation,<SUP> </SUP>as the =DF-catenin/Tcf complex will turn on=20
cycle-related<SUP> </SUP>genes, including <I>cyclin D1</I> and =
<I>c-Myc</I> (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B60"=
>60</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B61"=
>61</A>).=20
The signal responsible<SUP> </SUP>for regulation of the =DF-catenin COOH =
terminus=20
may<SUP> </SUP>be required to coordinate with the Wnt signal, which=20
primarily<SUP> </SUP>prevents =DF-catenin from degradation, to fully =
activate<SUP>=20
</SUP>stem cells. Indeed, the fact that a mutation in E-cadherin =
leads<SUP>=20
</SUP>to nuclearly localized =DF-catenin has been observed<SUP> </SUP>in =
breast=20
cancer seems to support this argument (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B62"=
>62</A>).<SUP>=20
</SUP>
<P>There is a certain degree of similarity in terms of the =
molecules<SUP>=20
</SUP>and the underlying machinery used by both normal stem cells<SUP> =
</SUP>for=20
homing or mobilization and cancer cells for invasion and<SUP> =
</SUP>metastasis.=20
For example, during HSC activation and mobilization,<SUP> </SUP>matrix=20
metalloproteinase-9 (MMP-9) is required for proteolysis<SUP> </SUP>of =
the=20
extracellular matrix components and converting stem cell<SUP> =
</SUP>factor from=20
a membrane-bound form into a free form, which then<SUP> </SUP>promotes =
HSC=20
proliferation and mobilization through c-Kit receptor<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B63"=
>63</A>).=20
Intriguingly, the molecules of the MMP family are key<SUP> =
</SUP>molecules=20
involved in the process of cancer cell metastasis<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B64"=
>64</A>).=20
Likewise, integrin is required for stem cell migration<SUP> </SUP>as =
evidenced=20
in both hematopoietic and neural systems (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B65"=
>65</A>,=20
<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B66"=
>66</A>),<SUP>=20
</SUP>and integrin has been reported to be associated with tumor =
cell<SUP>=20
</SUP>migration and metastasis (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B67"=
>67</A>).=20
Finally, cancer cell metastasis<SUP> </SUP>exhibits some properties =
shared by=20
stem cells, such as homing<SUP> </SUP>and mobilization in which SDF1 and =
CXCR4=20
play essential roles<SUP> </SUP>(<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B68"=
>68</A>).=20
It was recently found that SDF1 is also involved in breast<SUP> =
</SUP>cancer=20
cell migration (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B69"=
>69</A>).=20
In addition, recent data support<SUP> </SUP>the role of the vascular =
niche in=20
initiating metastasis (<A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#B70"=
>70</A>).<SUP>=20
</SUP>Thus, molecules involved in stem cell activation and =
mobilization<SUP>=20
</SUP>from the niche and homing to the niche are possible targets<SUP> =
</SUP>for=20
tumorigenesis, cancer development, and metastasis.<SUP> </SUP>
<P><A name=3DSEC5><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Closing Remarks </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#top"=
><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#ABS"=
><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC1=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Is Cancer a Disease...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC2=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Homeostatic Regulation of Stem...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC3=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Stem Cell Niche: Gatekeeper...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC4=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Link between Stem Cell...<BR></A><IMG height=3D9 =
alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT color=3D#464c53>Closing Remarks</FONT><BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#BIBL=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/darrow.gif" =
width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>N=
ormal=20
stem cells in adult somatic tissues and cancer stem cells<SUP> =
</SUP>share the=20
common features of self-renewal and slow cycling.<SUP> </SUP>Here, we =
have=20
proposed another potential niche function in preventing<SUP> =
</SUP>tumorigenesis=20
under normal physiologic conditions. The question<SUP> </SUP>arises as =
to=20
whether or not cancer stem cells are dependent<SUP> </SUP>upon the =
niche, as are=20
normal stem cells. This may vary with<SUP> </SUP>different types of =
tumors or=20
cancers. In general, cancer stem<SUP> </SUP>cells resulting from =
mutations in=20
stem/progenitor cells most<SUP> </SUP>likely undergo uncontrolled =
proliferation.=20
We hypothesize that<SUP> </SUP>cancer stem cells may also arise from a=20
microenvironment with<SUP> </SUP>dominant growth-promoting signals =
rather than=20
growth-inhibiting<SUP> </SUP>signals. This is supported by the fact that =
certain=20
types of<SUP> </SUP>neuroblastoma require coordination of mutations in =
both=20
Schwann<SUP> </SUP>cells and supportive cells (71) and, in general, =
rapid=20
tumor<SUP> </SUP>growth requires <I>de novo</I> angiogenesis, in which =
the=20
vascular<SUP> </SUP>niche provides growth-promoting signals with =
enriched=20
oxygen<SUP> </SUP>and nutrition. In addition, stem cell mobilization =
from or=20
homing<SUP> </SUP>to the niche uses molecular machinery similar to that=20
wrongly<SUP> </SUP>used by cancer cells for invasion and metastasis.=20
Exploring<SUP> </SUP>this process and the underlying molecular =
mechanisms will=20
provide<SUP> </SUP>important insight into understanding cancer cell=20
metastasis<SUP> </SUP>and will benefit developing treatments aimed at =
destroying=20
cancer<SUP> </SUP>stem cells without adversely affecting normal stem =
cell=20
self-renewal.<SUP> </SUP>
<P><A name=3DACK><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Acknowledgments </FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>We =
thank D. di Natale=20
for editorial assistance.<SUP> </SUP>
<P><A name=3DFN><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Footnotes </FONT></TH></TR></TBODY></TABLE>&nbsp;<BR><A=20
name=3D""><!-- null --></A><B>Note:</B> This review article is based on =
our=20
presentations at the<SUP> </SUP>American Association for Cancer Research =
2005=20
Pathobiology of<SUP> </SUP>Cancer Workshop.<SUP> </SUP>
<P><A name=3DFN1><!-- null --></A><SUP>4</SUP> Zhang and Li, unpublished =

data.<SUP> </SUP><A=20
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#RFN1=
"><IMG=20
height=3D12 alt=3DBack =
src=3D"http://cancerres.aacrjournals.org/icons/back.gif"=20
width=3D12 border=3D0></A>
<P>Received 11/ 4/05. Revised 1/20/05. Accepted 3/ 7/06.
<P><A name=3DBIBL><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/rarrow.gif" =
width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      References </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#top"=
><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Top<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#ABS"=
><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC1=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Is Cancer a Disease...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC2=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Homeostatic Regulation of Stem...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC3=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Stem Cell Niche: Gatekeeper...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC4=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Link between Stem Cell...<BR></A><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/9/4553#SEC5=
"><IMG=20
      height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/uarrow.gif" =
width=3D11=20
      border=3D0>Closing Remarks<BR></A><IMG height=3D9 alt=3D" " =
hspace=3D5=20
      src=3D"http://cancerres.aacrjournals.org/icons/toc/dot.gif" =
width=3D11=20
      border=3D0><FONT=20
color=3D#464c53>References</FONT><BR></FONT></TH></TR></TBODY></TABLE>&nb=
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://annonc.oxfordjournals.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://annonc.oxfordjournals.org/portal_imgs/search_result.gif"=20
      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://annonc.oxfordjournals.org/"><IMG height=3D16 =
alt=3D"Ann Oncol"=20
      =
src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
annonc.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/search/homelink.gif=
"=20
      width=3D49 vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
      size=3D-1>M. Mimeault and S. K. Batra<BR><STRONG>Interplay of =
distinct=20
      growth factors during epithelial mesenchymal transition of cancer=20
      progenitor cells and molecular targeting as novel cancer=20
      therapies</STRONG><BR>Ann. Onc., October&nbsp;1,&nbsp;2007; =
18(10): 1605 -=20
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>[Abstract]</A>=20
      <A=20
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href=3D"http://annonc.oxfordjournals.org/cgi/content/full/18/10/1605">[Fu=
ll=20
      Text]</A> <A=20
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href=3D"http://annonc.oxfordjournals.org/cgi/reprint/18/10/1605">[PDF]</A=
>=20
      <BR><IMG height=3D1 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D499>=20
    </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://stemcells.alphamedpress.org/portal_imgs/search_result.gif" =

      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D16 =
alt=3D"Stem Cells"=20
      =
src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
stemcells.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
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src=3D"http://cancerres.aacrjournals.org/icons/shared/search/homelink.gif=
"=20
      width=3D49 vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
      size=3D-1>V. K. Rajasekhar and M. Begemann<BR><STRONG>Concise =
Review: Roles=20
      of Polycomb Group Proteins in Development and Disease: A Stem Cell =

      Perspective</STRONG><BR>Stem Cells, October&nbsp;1,&nbsp;2007; =
25(10):=20
      2498 - 2510. <BR><A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/abstract/25/10/249=
8">[Abstract]</A>=20
      <A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/full/25/10/2498">[=
Full=20
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href=3D"http://stemcells.alphamedpress.org/cgi/reprint/25/10/2498">[PDF]<=
/A>=20
      <BR><IMG height=3D1 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D499>=20
    </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://stemcells.alphamedpress.org/portal_imgs/search_result.gif" =

      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D16 =
alt=3D"Stem Cells"=20
      =
src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
stemcells.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/search/homelink.gif=
"=20
      width=3D49 vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
      size=3D-1>A. Shiras, S. T Chettiar, V. Shepal, G. Rajendran, G. R. =
Prasad,=20
      and P. Shastry<BR><STRONG>Spontaneous Transformation of Human =
Adult=20
      Nontumorigenic Stem Cells to Cancer Stem Cells Is Driven by =
Genomic=20
      Instability in a Human Model of Glioblastoma</STRONG><BR>Stem =
Cells,=20
      June&nbsp;1,&nbsp;2007; 25(6): 1478 - 1489. <BR><A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/abstract/25/6/1478=
">[Abstract]</A>=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/full/25/6/1478">[F=
ull=20
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href=3D"http://stemcells.alphamedpress.org/cgi/reprint/25/6/1478">[PDF]</=
A>=20
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      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D499>=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
  <TBODY>
  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://edrv.endojournals.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      src=3D"http://edrv.endojournals.org/portal_imgs/search_result.gif" =
width=3D59=20
      vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
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      href=3D"http://edrv.endojournals.org/"><IMG height=3D16 =
alt=3D"Endocr. Rev."=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
edrv.gif"=20
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page"=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/search/homelink.gif=
"=20
      width=3D49 vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
      size=3D-1>R. R. Langley and I. J. Fidler<BR><STRONG>Tumor =
Cell-Organ=20
      Microenvironment Interactions in the Pathogenesis of Cancer=20
      Metastasis</STRONG><BR>Endocr. Rev., May&nbsp;1,&nbsp;2007; 28(3): =
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ract]</A>=20
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      <BR><IMG height=3D1 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D499>=20
    </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD></TR>
  <TR>
    <TD colSpan=3D6>
      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
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  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://stemcells.alphamedpress.org/portal_imgs/search_result.gif" =

      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://stemcells.alphamedpress.org/"><IMG height=3D16 =
alt=3D"Stem Cells"=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
stemcells.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/search/homelink.gif=
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      width=3D49 vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
      size=3D-1>S. Ahmad, R. Stewart, S. Yung, S. Kolli, L. Armstrong, =
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of Human=20
      Embryonic Stem Cells into Corneal Epithelial-Like Cells by In =
Vitro=20
      Replication of the Corneal Epithelial Stem Cell =
Niche</STRONG><BR>Stem=20
      Cells, May&nbsp;1,&nbsp;2007; 25(5): 1145 - 1155. <BR><A=20
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href=3D"http://stemcells.alphamedpress.org/cgi/content/abstract/25/5/1145=
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ull=20
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A>=20
      <BR><IMG height=3D1 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D499>=20
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width=3D5></TD></TR>
  <TR>
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      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
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  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://educationbook.aacrjournals.org/"><IMG height=3D80=20
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src=3D"http://educationbook.aacrjournals.org/portal_imgs/search_result.gi=
f"=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://educationbook.aacrjournals.org/"><IMG height=3D16=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
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  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D80 =
alt=3D"Home page"=20
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src=3D"http://cancerres.aacrjournals.org/portal_imgs/search_result.gif"=20
      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D16 =
alt=3D"Cancer Res."=20
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
canres.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
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src=3D"http://cancerres.aacrjournals.org/icons/shared/search/homelink.gif=
"=20
      width=3D49 vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
      size=3D-1>C. Li, D. G. Heidt, P. Dalerba, C. F. Burant, L. Zhang, =
V. Adsay,=20
      M. Wicha, M. F. Clarke, and D. M. =
Simeone<BR><STRONG>Identification of=20
      Pancreatic Cancer Stem Cells</STRONG><BR>Cancer Res.,=20
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>[Abstract]</A>=20
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
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  <TR bgColor=3D#d9d4c5>
    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://cancerres.aacrjournals.org/icons/spacer.gif" =
width=3D25><BR></TD>
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width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D80 =
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src=3D"http://cancerres.aacrjournals.org/portal_imgs/search_result.gif"=20
      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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width=3D5></TD>
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      href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D16 =
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src=3D"http://cancerres.aacrjournals.org/icons/shared/searchall/journals/=
canres.gif"=20
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page"=20
      =
src=3D"http://cancerres.aacrjournals.org/icons/shared/search/homelink.gif=
"=20
      width=3D49 vspace=3D5 border=3D0></A><BR><FONT =
face=3Dverdana,arial,helvetica=20
      size=3D-1><STRONG>Stem Cells and Cancer Stem =
Cells</STRONG><BR>Cancer Res.,=20
      June&nbsp;15,&nbsp;2006; 66(12): 6458 - 6458. <BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/66/12/6458">[F=
ull=20
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A>=20
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      size=3D-1>G. J. Strewler<BR><STRONG>The Stem Cell Niche and Bone=20
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19 - 29.=20
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      =
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Abstract]</A>=20
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      return this.getAllResponseHeader('*');=0A=
    };=0A=
    this.getAllResponseHeader =3D function(header) {=0A=
      var ret =3D '';=0A=
      for (var i =3D 0; i < this._headers.length; i++) {=0A=
        if (header =3D=3D '*' || this._headers[i].h =3D=3D header) {=0A=
          ret +=3D this._headers[i].h + ': ' + this._headers[i].v + '\n';=0A=
        }=0A=
      }=0A=
      return ret;=0A=
    };=0A=
    this.getResponseHeader =3D function(header) {=0A=
      var ret =3D getAllResponseHeader(header);=0A=
      var i =3D ret.indexOf('\n');=0A=
      if (i !=3D -1) {=0A=
        ret =3D ret.substring(0, i);=0A=
      }=0A=
      return ret;=0A=
    };=0A=
    this.setRequestHeader =3D function(header, value) {=0A=
      this._headers[this._headers.length] =3D {h:header, v:value};=0A=
    };=0A=
    this.open =3D function(method, url, async, user, password) {=0A=
      this.method =3D method;=0A=
      this.url =3D url;=0A=
      this._async =3D true;=0A=
      this._aborted =3D false;=0A=
      this._headers =3D [];=0A=
      if (arguments.length >=3D 3) {=0A=
        this._async =3D async;=0A=
      }=0A=
      if (arguments.length > 3) {=0A=
        opera.postError('XMLHttpRequest.open() - user/password not =
supported');=0A=
      }=0A=
      this.readyState =3D 1;=0A=
      if (this.onreadystatechange) {=0A=
        this.onreadystatechange();=0A=
      }=0A=
    };=0A=
    this.send =3D function(data) {=0A=
      if (!navigator.javaEnabled()) {=0A=
        alert("XMLHttpRequest.send() - Java must be installed and =
enabled.");=0A=
        return;=0A=
      }=0A=
      if (this._async) {=0A=
        setTimeout(this._sendasync, 0, this, data);=0A=
        // this is not really asynchronous and won't execute until the =
current=0A=
        // execution context ends=0A=
      } else {=0A=
        this._sendsync(data);=0A=
      }=0A=
    }=0A=
    this._sendasync =3D function(req, data) {=0A=
      if (!req._aborted) {=0A=
        req._sendsync(data);=0A=
      }=0A=
    };=0A=
    this._sendsync =3D function(data) {=0A=
      this.readyState =3D 2;=0A=
      if (this.onreadystatechange) {=0A=
        this.onreadystatechange();=0A=
      }=0A=
      // open connection=0A=
      var url =3D new java.net.URL(new =
java.net.URL(window.location.href), this.url);=0A=
      var conn =3D url.openConnection();=0A=
      for (var i =3D 0; i < this._headers.length; i++) {=0A=
        conn.setRequestProperty(this._headers[i].h, this._headers[i].v);=0A=
      }=0A=
      this._headers =3D [];=0A=
      if (this.method =3D=3D 'POST') {=0A=
        // POST data=0A=
        conn.setDoOutput(true);=0A=
        var wr =3D new =
java.io.OutputStreamWriter(conn.getOutputStream(), this._getCharset());=0A=
        wr.write(data);=0A=
        wr.flush();=0A=
        wr.close();=0A=
      }=0A=
      // read response headers=0A=
      // NOTE: the getHeaderField() methods always return nulls for me :(=0A=
      var gotContentEncoding =3D false;=0A=
      var gotContentLength =3D false;=0A=
      var gotContentType =3D false;=0A=
      var gotDate =3D false;=0A=
      var gotExpiration =3D false;=0A=
      var gotLastModified =3D false;=0A=
      for (var i =3D 0; ; i++) {=0A=
        var hdrName =3D conn.getHeaderFieldKey(i);=0A=
        var hdrValue =3D conn.getHeaderField(i);=0A=
        if (hdrName =3D=3D null && hdrValue =3D=3D null) {=0A=
          break;=0A=
        }=0A=
        if (hdrName !=3D null) {=0A=
          this._headers[this._headers.length] =3D {h:hdrName, =
v:hdrValue};=0A=
          switch (hdrName.toLowerCase()) {=0A=
            case 'content-encoding': gotContentEncoding =3D true; break;=0A=
            case 'content-length'  : gotContentLength   =3D true; break;=0A=
            case 'content-type'    : gotContentType     =3D true; break;=0A=
            case 'date'            : gotDate            =3D true; break;=0A=
            case 'expires'         : gotExpiration      =3D true; break;=0A=
            case 'last-modified'   : gotLastModified    =3D true; break;=0A=
          }=0A=
        }=0A=
      }=0A=
      // try to fill in any missing header information=0A=
      var val;=0A=
      val =3D conn.getContentEncoding();=0A=
      if (val !=3D null && !gotContentEncoding) =
this._headers[this._headers.length] =3D {h:'Content-encoding', v:val};=0A=
      val =3D conn.getContentLength();=0A=
      if (val !=3D -1 && !gotContentLength) =
this._headers[this._headers.length] =3D {h:'Content-length', v:val};=0A=
      val =3D conn.getContentType();=0A=
      if (val !=3D null && !gotContentType) =
this._headers[this._headers.length] =3D {h:'Content-type', v:val};=0A=
      val =3D conn.getDate();=0A=
      if (val !=3D 0 && !gotDate) this._headers[this._headers.length] =
=3D {h:'Date', v:(new Date(val)).toUTCString()};=0A=
      val =3D conn.getExpiration();=0A=
      if (val !=3D 0 && !gotExpiration) =
this._headers[this._headers.length] =3D {h:'Expires', v:(new =
Date(val)).toUTCString()};=0A=
      val =3D conn.getLastModified();=0A=
      if (val !=3D 0 && !gotLastModified) =
this._headers[this._headers.length] =3D {h:'Last-modified', v:(new =
Date(val)).toUTCString()};=0A=
      // read response data=0A=
      var reqdata =3D '';=0A=
      var stream =3D conn.getInputStream();=0A=
      if (stream) {=0A=
        var reader =3D new java.io.BufferedReader(new =
java.io.InputStreamReader(stream, this._getCharset()));=0A=
        var line;=0A=
        while ((line =3D reader.readLine()) !=3D null) {=0A=
          if (this.readyState =3D=3D 2) {=0A=
            this.readyState =3D 3;=0A=
            if (this.onreadystatechange) {=0A=
              this.onreadystatechange();=0A=
            }=0A=
          }=0A=
          reqdata +=3D line + '\n';=0A=
        }=0A=
        reader.close();=0A=
        this.status =3D 200;=0A=
        this.statusText =3D 'OK';=0A=
        this.responseText =3D reqdata;=0A=
        this.readyState =3D 4;=0A=
        if (this.onreadystatechange) {=0A=
          this.onreadystatechange();=0A=
        }=0A=
        if (this.onload) {=0A=
          this.onload();=0A=
        }=0A=
      } else {=0A=
        // error=0A=
        this.status =3D 404;=0A=
        this.statusText =3D 'Not Found';=0A=
        this.responseText =3D '';=0A=
        this.readyState =3D 4;=0A=
        if (this.onreadystatechange) {=0A=
          this.onreadystatechange();=0A=
        }=0A=
        if (this.onerror) {=0A=
          this.onerror();=0A=
        }=0A=
      }=0A=
    };=0A=
  };=0A=
}=0A=
// ActiveXObject emulation=0A=
if (!window.ActiveXObject && window.XMLHttpRequest) {=0A=
  window.ActiveXObject =3D function(type) {=0A=
    switch (type.toLowerCase()) {=0A=
      case 'microsoft.xmlhttp':=0A=
      case 'msxml2.xmlhttp':=0A=
      case 'msxml2.xmlhttp.3.0':=0A=
      case 'msxml2.xmlhttp.4.0':=0A=
      case 'msxml2.xmlhttp.5.0':=0A=
        return new XMLHttpRequest();=0A=
    }=0A=
    return null;=0A=
  };=0A=
}=0A=

------=_NextPart_000_005B_01C89190.9A597050
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://cancerres.aacrjournals.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=
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------=_NextPart_000_005B_01C89190.9A597050
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://cancerres.aacrjournals.org/javascript/entrez/callback.js

/************************************************************************=
*****=0A=
 * javascript/entrez/callback.js=0A=
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 * Entrez Linking callback to populate content box.=0A=
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 * Copyright 2006 Board of Trustees of the Leland Stanford Junior =
University.=0A=
 =
*************************************************************************=
***/=0A=
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/*=0A=
 * Execute callback to fill content box with Entrez Linking information.=0A=
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function entrez_callback(pmid, callback_url) {=0A=
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   * used for Entrez Linking. For now we have to disable=0A=
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}=0A=

------=_NextPart_000_005B_01C89190.9A597050
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=
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//-- 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=
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//-- 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 =
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var _ulink=3D0;			// enable linker functionality (1=3Don|0=3Doff)=0A=
var _uanchor=3D0;			// enable use of anchors for campaign =
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var _utcp=3D"/";			// the cookie path for tracking=0A=
var _usample=3D100;		// The sampling % of visitors to track (1-100).=0A=
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var _uctm=3D1;			// set campaign tracking module (1=3Don|0=3Doff)=0A=
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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=
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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=
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//-- **** Don't modify below this point ***=0A=
var =
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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=
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 if (_udn && _udn!=3D"") { _udo=3D" domain=3D"+_udn+";"; }=0A=
 if (_utimeout && _utimeout!=3D"") {=0A=
  x=3Dnew Date(_udt.getTime()+(_utimeout*1000));=0A=
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  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=
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  _ubd.cookie=3D"__utmb=3D"+_udh+"; path=3D"+_utcp+";"+x+_udo;=0A=
  _ubd.cookie=3D"__utmc=3D"+_udh+"; path=3D"+_utcp+";"+_udo;=0A=
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path=3D"+_utcp+";"+nx+_udo;=0A=
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 if (_ulink && v && v!=3D"" && v!=3D"-") {=0A=
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 if (!page || page=3D=3D"") _uff=3D1;=0A=
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function _uInfo(page) {=0A=
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 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=
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   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=
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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_005B_01C89190.9A597050--

