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Subject: Persistence of a small subpopulation of cancer stem-like cells in the C6 glioma cell line -- Kondo et al. 101 (3): 781 -- Proceedings of the National Academy of Sciences
Date: Fri, 17 Nov 2006 15:06:37 +0100
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color=3D#660033 size=3D+1><STRONG>Published online before print January =
7, 2004,=20
10.1073/pnas.0307618100</FONT></STRONG> <BR><FONT size=3D-1>PNAS | =
<B>January 20,=20
2004</B> | vol. 101 | no. 3 | <B>781-786</B> </FONT><BR><BR><BR>
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<P><STRONG><FONT color=3D#a70716 size=3D-2>DEVELOPMENTAL=20
BIOLOGY</FONT></STRONG><BR><STRONG><FONT size=3D+2>Persistence of a =
small=20
subpopulation of cancer stem-like cells in the C6 glioma cell line=20
</FONT></STRONG>
<P><STRONG></NOBR><NOBR>Toru Kondo<SUP>&nbsp;*</SUP><SUP>&nbsp;<IMG =
alt=3D{dagger}=20
src=3D"http://www.pnas.org/math/dagger.gif" border=3D0></SUP><A=20
name=3DRFN1></A><SUP>&nbsp;<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FN1"><IMG =
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src=3D"http://www.pnas.org/math/link//Dagger.gif" =
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href=3D"http://www.pnas.org/cgi/content/full/101/3/781#COR1"><IMG =
alt=3D=A7=20
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<NOBR>Takao Setoguchi<SUP>&nbsp;<IMG alt=3D{dagger}=20
src=3D"http://www.pnas.org/math/dagger.gif" border=3D0></SUP><A=20
name=3DRFN1></A><SUP>&nbsp;<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FN1"><IMG =
alt=3D{ddagger}=20
src=3D"http://www.pnas.org/math/link//Dagger.gif"=20
border=3D0></A></SUP><SUP>&nbsp;=B6</SUP></NOBR>, and <NOBR>Tetsuya=20
Taga<SUP>&nbsp;*</SUP></NOBR> </STRONG>
<P><SUP>*</SUP>Department of Cell Fate Modulation, Institute of =
Molecular=20
Embryology and Genetics, Kumamoto University, 2-2-1 Honjo, Kumamoto =
860-0811,=20
Japan;<SUP><IMG alt=3D{dagger} =
src=3D"http://www.pnas.org/math/dagger.gif"=20
border=3D0></SUP>Centre for Brain Repair, University of Cambridge, E. D. =
Adrian=20
Building, Forvie Site, Robinson Way, Cambridge CB2 2PY, United Kingdom; =
and=20
<SUP>=B6</SUP>Department of Orthopaedic Surgery, Kagoshima Graduate =
School of=20
Medicine and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima 890-8520, =
Japan=20
<P>Communicated by Martin C. Raff, University College London, London, =
United=20
Kingdom, November 20, 2003 (received for review September 1, 2003)
<P>
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      border=3D0>Materials and Methods<BR></A><A=20
      href=3D"http://www.pnas.org/cgi/content/full/101/3/781#SEC2"><IMG =
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      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>B=
oth stem=20
cells and cancer cells are thought to be capable of<SUP> </SUP>unlimited =

proliferation. Paradoxically, however, some cancers<SUP> </SUP>seem to =
contain=20
stem-like cells (cancer stem cells). To help<SUP> </SUP>resolve this =
paradox, we=20
investigated whether established malignant<SUP> </SUP>cell lines, which =
have=20
been maintained for years in culture,<SUP> </SUP>contain a subpopulation =
of stem=20
cells. In this article, we show<SUP> </SUP>that many cancer cell lines =
contain a=20
small side population<SUP> </SUP>(SP), which, in many normal tissues, is =
thought=20
to contain the<SUP> </SUP>stem cells of the tissue. We demonstrate that =
in the=20
absence<SUP> </SUP>of serum the combination of basic fibroblast growth =
factor=20
and<SUP> </SUP>platelet-derived growth factor maintains SP cells in the =
C6<SUP>=20
</SUP>glioma cell line. Moreover, we show that C6 SP cells, but not<SUP> =

</SUP>non-SP cells, can generate both SP and non-SP cells in =
culture<SUP>=20
</SUP>and are largely responsible for the <I>in vivo</I> malignancy of =
this<SUP>=20
</SUP>cell line. Finally, we provide evidence that C6 SP cells can<SUP>=20
</SUP>produce both neurons and glial cells <I>in vitro</I> and <I>in =
vivo</I>.=20
We<SUP> </SUP>propose that many cancer cell lines contain a minor=20
subpopulation<SUP> </SUP>of stem cells that is enriched in an SP, can be =

maintained indefinitely<SUP> </SUP>in culture, and is crucial for their=20
malignancy.<SUP> </SUP>
<P>
<HR align=3Dcenter width=3D"50%" noShade SIZE=3D1>
Like stem cells, cancer cells are widely thought to be able<SUP> =
</SUP>to=20
proliferate indefinitely, and yet it is notoriously difficult<SUP> =
</SUP>to=20
establish immortal cell lines in culture from primary cancers.<SUP> =
</SUP>When=20
such cell lines have been established, however, they retain<SUP> =
</SUP>the=20
ability to reform the original cancer <I>in vivo</I>. One =
possibility<SUP>=20
</SUP>is that cancers arise in cells with the characteristics of =
stem<SUP>=20
</SUP>cells, which, by definition, can self-renew indefinitely. =
Another<SUP>=20
</SUP>possibility is that cancer cells acquire the property of =
unlimited<SUP>=20
</SUP>proliferation by mutation, which might be essential for =
malignancy,<SUP>=20
</SUP>as well as for primary human cells in culture to pass through<SUP> =

</SUP>the Hayflick limit (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF1">1</A>).<SUP>=
 </SUP>
<P>There is increasing evidence that cancers might contain their<SUP> =
</SUP>own=20
stem cells. Many cancers, like normal organs, seem to be<SUP> =
</SUP>maintained=20
by a hierarchical organization that includes slowly<SUP> </SUP>dividing =
stem=20
cells, rapidly dividing transit amplifying cells<SUP> </SUP>(precursor =
cells),=20
and differentiated cells (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF2">2</A>=96<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF6">6</A>).=20
Malignant<SUP> </SUP>gliomas, for example, often contain both =
undifferentiated=20
and<SUP> </SUP>differentiated cells and sometimes contain cells that=20
express<SUP> </SUP>neuronal markers as well as cells that express glial=20
markers,<SUP> </SUP>suggesting that they may contain multipotent neural =
stem=20
cell<SUP> </SUP>(NSC)-like cells (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF7">7</A>=96<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF9">9</A>). =
Such mixed=20
gliomas may develop<SUP> </SUP>from NSCs or from more restricted glial =
lineage=20
cells that acquire<SUP> </SUP>multipotential stem-cell-like properties =
by=20
mutation (<A =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF10">10</A>,=20
<A =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF11">11</A>).<SU=
P>=20
</SUP>Yet, even normal oligodendrocyte precursor cells can be =
induced<SUP>=20
</SUP>by extracellular signals <I>in vitro</I> to acquire =
stem-cell-like<SUP>=20
</SUP>properties, and some NSCs <I>in vivo</I> express the astrocyte =
marker<SUP>=20
</SUP>glial fibrillary acidic protein (GFAP) (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF12">12</A>=96<A=
=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF17">17</A>).<SU=
P> </SUP>
<P>The presence of a small subpopulation of slowly dividing cancer<SUP>=20
</SUP>stem cells might explain why so many cancers recur after =
treatment<SUP>=20
</SUP>with irradiation or cytotoxic drugs, even when most of the =
cancer<SUP>=20
</SUP>cells seem to be killed by the therapy. Usually, some cancer<SUP>=20
</SUP>cells survive the treatment, and these surviving cells may be<SUP> =

</SUP>cancer stem cells, which may be not only resistant to the =
therapy<SUP>=20
</SUP>but also essential for the malignancy of the cancer. It has<SUP>=20
</SUP>been shown that various types of ATP-binding cassette (ABC)<SUP>=20
</SUP>transporters, including those encoded by the =
multidrug-resistant<SUP>=20
</SUP>(MDR) gene 1, the MDR protein (MRP), and the breast =
cancer-resistant<SUP>=20
</SUP>protein 1 (BCRP1), contribute to drug resistance in many =
cancers<SUP>=20
</SUP>by pumping the drugs out of the cell (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF18">18</A>).=20
Interestingly, some<SUP> </SUP>of these transporters are expressed also =
by many=20
kinds of stem<SUP> </SUP>cells. BCRP1, for example, pumps out the =
fluorescent=20
dye Hoechst<SUP> </SUP>33342, identifying an unlabeled side population =
(SP),=20
which<SUP> </SUP>is enriched for stem cells (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF19">19</A>=96<A=
=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF22">22</A>). =
Taken=20
together, these<SUP> </SUP>findings suggest that cancers might contain =
an SP=20
with the characteristics<SUP> </SUP>of stem cells.<SUP> </SUP>
<P>Here we show that many established cancer cell lines contain<SUP> =
</SUP>SP=20
cells, which are apparently maintained in normal serum-containing<SUP>=20
</SUP>cultures over decades. We demonstrate that platelet-derived<SUP>=20
</SUP>growth factor (PDGF) and basic fibroblast growth factor =
(bFGF)<SUP>=20
</SUP>can maintain the SP cells in the C6 glioma cell line in the<SUP>=20
</SUP>absence of serum and that the SP cells can produce both =
neuronal<SUP>=20
</SUP>and glial cells. Finally, we show that FACS-sorted C6 SP =
cells,<SUP>=20
</SUP>but not non-SP C6 cells, can produce both SP and non-SP cells<SUP> =

</SUP>in culture and form tumors in multiple tissues in nude mice,<SUP>=20
</SUP>which contain both neurons and glia, indicating that these =
cells<SUP>=20
</SUP>have the characteristics of multipotent cancer stem cells. =
Our<SUP>=20
</SUP>findings suggest that the SP may be a general source of =
cancer<SUP>=20
</SUP>stem cells, which need to be targeted for effective cancer =
therapy.<SUP>=20
</SUP>
<P><A name=3DSEC1><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/rarrow.gif"=20
    width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Materials and Methods </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://www.pnas.org/cgi/content/full/101/3/781#top"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Top<BR></A><A=20
      href=3D"http://www.pnas.org/cgi/content/full/101/3/781#ABS"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Abstract<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.pnas.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>Materials and Methods</FONT><BR><A=20
      href=3D"http://www.pnas.org/cgi/content/full/101/3/781#SEC2"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>Results<BR></A><A=20
      href=3D"http://www.pnas.org/cgi/content/full/101/3/781#SEC3"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>Discussion<BR></A><A=20
      href=3D"http://www.pnas.org/cgi/content/full/101/3/781#BIBL"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/darrow.gif" width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR><=
B>Chemicals.</B>=20
Chemicals were purchased from Sigma unless indicated<SUP> =
</SUP>otherwise.=20
Recombinant cytokines were purchased from PeproTech<SUP> </SUP>(Rocky =
Hill, NJ)=20
unless indicated otherwise.<SUP> </SUP>
<P><B>Cell Culture.</B> Various cancer cell lines were studied, =
including<SUP>=20
</SUP>the rat glioma line C6, the human breast cancer line MCF-7,<SUP> =
</SUP>the=20
human osteosarcoma lines U-20S and SaOS-2, the rat neuroblastoma<SUP> =
</SUP>line=20
B104, and the human adenocarcinoma line HeLa. The cells<SUP> </SUP>were =
cultured=20
in DMEM, supplemented with 10% FCS, 100 units/ml<SUP> </SUP>penicillin =
G, and=20
100 =B5g/ml streptomycin (GIBCO). In some<SUP> </SUP>experiments, C6 =
cells were=20
cultured in serum-free DMEM containing<SUP> </SUP>10 =B5g/ml bovine =
insulin, 100=20
=B5g/ml human transferrin,<SUP> </SUP>100 =B5g/ml BSA, 60 ng/ml =
progesterone, 16=20
=B5g/ml putrescine,<SUP> </SUP>40 ng/ml sodium selenite, 63 =B5g/ml=20
<I>N</I>-acetylcysteine, 5<SUP> </SUP>=B5M forskolin, 50 units/ml =
penicillin, and=20
50 =B5g/ml<SUP> </SUP>streptomycin (GIBCO), as well as 10 ng/ml bFGF, 10 =
ng/ml=20
PDGF,<SUP> </SUP>or both. In all experiments, cells were maintained in=20
100-mm<SUP> </SUP>culture dishes (Nunc) at 37=B0C in a humidified 5%=20
CO<SUB>2</SUB>/95%<SUP> </SUP>air atmosphere.<SUP> </SUP>
<P><B>Flow Cytometry.</B> To identify and isolate the SP cells in =
the<SUP>=20
</SUP>cancer cell lines, we cultured the lines, as described above,<SUP> =

</SUP>in either FCS or serum-free culture medium with bFGF, PDGF,<SUP> =
</SUP>or=20
both. The cells were removed from the culture dish with trypsin<SUP> =
</SUP>and=20
EDTA (GIBCO BRL), washed, suspended at 10<SUP>6</SUP> cells per ml<SUP> =
</SUP>in=20
DMEM containing 2% FCS (staining medium), and preincubated<SUP> </SUP>in =
a=20
1.5-ml Eppendorf tube at 37=B0C for 10 min. The cells<SUP> </SUP>were =
then labeled=20
in the same medium at 37=B0C for 90 min<SUP> </SUP>with 2.5 =B5g/ml =
Hoechst 33342=20
dye (Molecular Probes), either<SUP> </SUP>alone or in combination with =
50 =B5M=20
verapamil (Sigma),<SUP> </SUP>which is an inhibitor of some=20
(verapamil-sensitive) ABC transporters<SUP> </SUP>(<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF19">19</A>). =
Finally,=20
the cells were counterstained with 1 =B5g/ml<SUP> </SUP>propidium iodide =
to label=20
dead cells.<SUP> </SUP>
<P>Then, 3=965 <FONT face=3Darial,helvetica>x</FONT> 10<SUP>4</SUP> =
cells were=20
analyzed in a FACSVantage fluorescence-activated<SUP> </SUP>cell sorter =
(Becton=20
Dickinson) by using a dual-wavelength analysis<SUP> </SUP>(blue, =
424=96444 nm;=20
red, 675 nm) after excitation with<SUP> </SUP>350-nm UV light. Propidium =

iodide-positive dead cells (&lt;15%)<SUP> </SUP>were excluded from the =
analysis.=20
In the case of C6, the SP cells<SUP> </SUP>or non-SP cells were sorted =
and=20
cultured in serum-free culture<SUP> </SUP>medium with bFGF and =
PDGF.<SUP> </SUP>
<P><B>RNA Extraction and RT-PCR Assay.</B> Cells were harvested, and=20
poly(A)<SUP>+</SUP><SUP> </SUP>RNA was prepared by using a QuickPrep =
Micro mRNA=20
purification<SUP> </SUP>kit (Amersham Biosciences) and reverse =
transcribed by=20
using<SUP> </SUP>a First-Strand cDNA synthesis kit (Amersham =
Biosciences),=20
as<SUP> </SUP>described (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF13">13</A>). =
The RT-PCR=20
was carried out in a 20-=B5l<SUP> </SUP>reaction mixture that contained =
1 =B5l of=20
cDNA as template,<SUP> </SUP>1 =B5M specific oligonucleotide primer =
pair, and 0.5=20
unit<SUP> </SUP>of <I>Taq</I> DNA polymerase (Takara Shuzo, Kyoto). =
Cycle=20
parameters<SUP> </SUP>for <I>bcrp1, mdr1</I>, or <I>g3pdh</I> cDNAs were =
30 sec=20
at 94=B0C, 30<SUP> </SUP>sec at 60=B0C, and 60 sec at 72=B0C for 33, 32, =
and 25=20
cycles,<SUP> </SUP>respectively. The identity of the amplified products =
was=20
checked<SUP> </SUP>by digestion with appropriate restriction enzymes.=20
Oligonucleotide<SUP> </SUP>DNA primers were synthesized as follows. For =
rat=20
<I>bcrp1</I>, we used<SUP> </SUP>sequences conserved between human and =
mouse:=20
5', 5'-CCAGTTCCATGGCACTGGCCATA-3'<SUP> </SUP>and 3',=20
5'-CAGGGCCACATGATTCTTCCACA-3'. For rat <I>mdr1</I>, we used<SUP> =
</SUP>sequences=20
conserved between human and mouse: 5', =
5'-GCAAAGCTGGAGAGATCCTCACCA-3'<SUP>=20
</SUP>and 3', 5'-CAACATTTTCATTTCAACAACTCCTGC-3'. For rat <I>g3pdh</I>, =
the<SUP>=20
</SUP>following sequences were used: 5', 5'-ACCACAGTCCATGCCATCAC-3'<SUP> =

</SUP>and 3', 5'-TCCACCACCCTGTTGCTGTA-3'.<SUP> </SUP>
<P><B>Immunostaining of Cultured Cells.</B> To examine the =
expression<SUP>=20
</SUP>of neuronal and glial markers in C6 SP cells cultured for 1<SUP> =
</SUP>or=20
10 d, the cells were cultured overnight in chamber slides<SUP> =
</SUP>(Nunc)=20
precoated with 1 =B5g/ml fibronectin (Invitrogen)<SUP> </SUP>and 15 =
=B5g/ml=20
ornithine (Sigma). The cells were fixed with<SUP> </SUP>2% =
paraformaldehyde for=20
10 min at room temperature, treated<SUP> </SUP>with 20% FCS, and then =
stained=20
with the following mouse monoclonal<SUP> </SUP>antibodies: anti-GFAP =
(1:200;=20
Sigma), anti-<IMG alt=3D{beta} src=3D"http://www.pnas.org/math/beta.gif" =

border=3D0>-III tubulin (1:200;<SUP> </SUP>Sigma), =
anti-microtubule-associated=20
protein 2 (MAP2; 1:500;<SUP> </SUP>Sigma), and anti-nestin (1:200; =
Pharmingen).=20
The primary antibodies<SUP> </SUP>were detected with Texas =
red-conjugated goat=20
anti-mouse IgM<SUP> </SUP>or IgG (1:100; Jackson ImmunoResearch) as =
described=20
(<A =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF13">13</A>).=20
The<SUP> </SUP>cells were counterstained with Hoechst 33342 to identify =
all<SUP>=20
</SUP>nuclei.<SUP> </SUP>
<P><B>Transplantation into Nude Mice.</B> KSL/slc nude mice were =
purchased<SUP>=20
</SUP>from SLC (Shizuoka, Japan). FACS-sorted C6 SP and non-SP =
cells<SUP>=20
</SUP>were cultured for 7 d in bFGF plus PDGF, and 10<SUP>5</SUP> cells =
of=20
each<SUP> </SUP>type were injected i.p. into three 4-wk-old female nude=20
mice.<SUP> </SUP>The same experiment was repeated twice with similar=20
results.<SUP> </SUP>The mice were killed 18 d after injection and =
examined for=20
tumors,<SUP> </SUP>as described below. Mice were treated according to =
the=20
guidelines<SUP> </SUP>of the Kumamoto University Animal Committee.<SUP> =
</SUP>
<P><B>Hematocrit Analysis.</B> Blood was collected in EDTA at a =
final<SUP>=20
</SUP>concentration of 1 mM. Glass microcapillary tubes =
(Hirschmann)<SUP>=20
</SUP>were filled with blood, capped with Parafilm, and centrifuged<SUP> =

</SUP>at 3,000 <FONT face=3Darial,helvetica>x</FONT> <I>g</I> for 1 min, =
and the=20
hematocrit was calculated as<SUP> </SUP>the proportion of the tube =
containing=20
erythrocytes.<SUP> </SUP>
<P><B>Immunostaining of Tissue Sections.</B> Tumor-bearing tissues =
were<SUP>=20
</SUP>fixed in 4% paraformaldehyde, embedded in Tissue-Tek OCT =
(optimal<SUP>=20
</SUP>cutting temperature) compound, and then frozen at =9620=B0C.<SUP>=20
</SUP>Cryostat sections (12 =B5m) were cut, mounted on poly-<FONT=20
size=3D-2>L</FONT>-lysine-coated<SUP> </SUP>slides, and air-dried for 24 =
h. To=20
characterize the cells in<SUP> </SUP>tumors, the sections were treated =
with 10%=20
normal goat serum<SUP> </SUP>(DAKO) for 30 min at room temperature and =
then=20
stained with<SUP> </SUP>the following mouse monoclonal antibodies: =
anti-nestin=20
antibody,<SUP> </SUP>anti-GFAP antibody, and anti-low molecular weight=20
neurofilament<SUP> </SUP>antibody (1:200; Sigma). The primary antibodies =
were=20
detected<SUP> </SUP>with Alexa 594-conjugated goat anti-mouse IgG =
(1:200;=20
Molecular<SUP> </SUP>Probes), as described (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF13">13</A>). =
The cells=20
were counterstained with<SUP> </SUP>Hoechst 33342 to identify all =
nuclei. The=20
stained sections were<SUP> </SUP>examined and photographed in an AX70=20
fluorescence microscope<SUP> </SUP>(Olympus, Orangeburg, NY).<SUP> =
</SUP>
<P><A name=3DSEC2><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/rarrow.gif"=20
    width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Results </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://www.pnas.org/cgi/content/full/101/3/781#top"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Top<BR></A><A=20
      href=3D"http://www.pnas.org/cgi/content/full/101/3/781#ABS"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      href=3D"http://www.pnas.org/cgi/content/full/101/3/781#SEC1"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Materials and Methods<BR></A><IMG height=3D9 alt=3D" " =
hspace=3D5=20
      src=3D"http://www.pnas.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>Results</FONT><BR><A=20
      href=3D"http://www.pnas.org/cgi/content/full/101/3/781#SEC3"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/darrow.gif" width=3D11=20
      border=3D0>Discussion<BR></A><A=20
      href=3D"http://www.pnas.org/cgi/content/full/101/3/781#BIBL"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/darrow.gif" width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR><=
B>Many=20
Cancer Cell Lines Contain a Small SP.</B> To determine whether<SUP> =
</SUP>any of=20
the six established cancer cell lines in our collection<SUP> </SUP>(see=20
<I>Materials and Methods</I>) contained SP cells, we removed the<SUP>=20
</SUP>cells from the culture dishes with trypsin and EDTA and =
stained<SUP>=20
</SUP>them with the fluorescent dye Hoechst 33342, which has been<SUP>=20
</SUP>shown to be extruded actively by the SP cells in various =
tissues<SUP>=20
</SUP>by means of verapamil-sensitive ABC transporters. We then =
analyzed<SUP>=20
</SUP>them by flow cytometry. As shown in <A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG1">Fig. 1</A>, =
the C6=20
glioma cells<SUP> </SUP>contained 0.4% SP cells (<I>A</I>), the MCF7 =
breast=20
cancer cells contained<SUP> </SUP>2.0% SP cells (<I>B</I>), the B104=20
neuroblastoma cells contained 0.4%<SUP> </SUP>SP cells (<I>C</I>), and =
the HeLa=20
carcinoma cells contained 1.2% SP<SUP> </SUP>cells (<I>D</I>). In each =
case, the=20
SP population was decreased greatly<SUP> </SUP>by treatment with =
verapamil (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG1">Fig. =
1</A>),=20
indicating that the populations<SUP> </SUP>were bona fide SPs. Thus, =
some cancer=20
cell lines contain a small<SUP> </SUP>SP, despite having been maintained =
in=20
culture for many years.<SUP> </SUP>We could not detect SP cells in the =
two human=20
osteosarcoma lines<SUP> </SUP>(U-2OS and SaOS-2) that we tested (data =
not=20
shown), suggesting<SUP> </SUP>that not all cancer cell lines have an SP. =
The=20
rest of our experiments<SUP> </SUP>were focused on C6 cells.<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://www.pnas.org/cgi/content/full/101/3/781/FIG1"><IMG=20
            height=3D106 alt=3D" " hspace=3D10=20
            =
src=3D"http://www.pnas.org/content/vol101/issue3/images/small/zpq00204344=
10001.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (41K):<BR><NOBR><A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781/FIG1">[in this=20
            window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG1', 590, 434); =
this.href=3D'/cgi/content-nw/full/101/3/781/FIG1'"=20
            =
href=3D"http://www.pnas.org/cgi/content-nw/full/101/3/781/FIG1"=20
            target=3DFIG1>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG><B>Fig. 1.</B></STRONG> =
Existence=20
            of SP cells in established cancer cell lines. Cells of the =
rat C6=20
            glioma (<I>A</I>), human MCF7 breast carcinoma (<I>B</I>), =
rat B104=20
            neuroblastoma (<I>C</I>), and human HeLa carcinoma =
(<I>D</I>) cell=20
            lines were labeled with the Hoechst 33342 and then analyzed =
by flow=20
            cytometry. (<I>Lower</I>) Results when the cells were =
treated with=20
            50 =B5M verapamil during the labeling procedure. The SP, =
which=20
            disappears in the presence of verapamil, is outlined and =
shown as a=20
            percentage of the total cell population. These experiments =
were=20
            repeated at least three times with similar results.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER><SUP>=
</SUP>
<P><B>C6 SP Cells Can Be Expanded in bFGF Plus PDGF.</B> We then=20
investigated<SUP> </SUP>which factor(s) can maintain C6 SP cells in =
serum-free=20
culture<SUP> </SUP>media. We tested PDGF and bFGF (FGF-2) as possible=20
candidates.<SUP> </SUP>PDGF is the main mitogen for oligodendrocyte =
precursor=20
cells<SUP> </SUP>(<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF23">23</A>=96<A=
=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF25">25</A>), =
whereas=20
bFGF is a major mitogen for NSCs (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF26">26</A>,<SUP=
>=20
</SUP><A =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF27">27</A>). =
We=20
first cultured unfractionated C6 cells on uncoated dishes<SUP> </SUP>in =
10% FCS=20
or in serum-free culture medium with PDGF, bFGF,<SUP> </SUP>or both.=20
Surprisingly, the morphology of the cells was very<SUP> </SUP>different =
in the=20
different culture conditions. In FCS or bFGF<SUP> </SUP>alone, the cells =
had a=20
flat, fibroblast-like shape (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG2">Fig. 2 =
<I>A</I><SUP>=20
</SUP>and <I>B</I></A>). In PDGF, they had a round body but were still=20
attached<SUP> </SUP>to the dish (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG2">Fig. =
2<I>C</I></A>).=20
In the presence of both bFGF and PDGF,<SUP> </SUP>by contrast, they =
formed=20
floating, neurosphere-like cell aggregates<SUP> </SUP>after 10 d (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG2">Fig. =
2<I>D</I></A>),=20
just as CNS NSCs do under similar conditions<SUP> </SUP>(<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF28">28</A>). =
We then=20
stained the cells with Hoechst 33342 and analyzed<SUP> </SUP>them by =
flow=20
cytometry. When cultured in serum-free medium with<SUP> </SUP>both PDGF =
and=20
bFGF, SP cells were maintained, and their proportion<SUP> =
</SUP>increased with=20
time (<A =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG2">Fig. 2 =
<I>E,=20
H</I>, and <I>I</I></A>). By contrast, when<SUP> </SUP>cultured in =
either bFGF=20
or PDGF alone, the C6 cells survived<SUP> </SUP>and proliferated, but by =
3 wk=20
few SP cells could be detected<SUP> </SUP>(<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG2">Fig. 2 =
<I>F, G</I>,=20
and <I>I</I></A>). These findings suggest that C6 SP cells<SUP> =
</SUP>can expand=20
in a combination of bFGF and PDGF but cannot be maintained<SUP> </SUP>in =
either=20
growth factor alone.<SUP> </SUP>
<P><A name=3DFIG2><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781/FIG2"><IMG=20
            height=3D85 alt=3D" " hspace=3D10=20
            =
src=3D"http://www.pnas.org/content/vol101/issue3/images/small/zpq00204344=
10002.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (53K):<BR><NOBR><A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781/FIG2">[in this=20
            window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG2', 590, 386); =
this.href=3D'/cgi/content-nw/full/101/3/781/FIG2'"=20
            =
href=3D"http://www.pnas.org/cgi/content-nw/full/101/3/781/FIG2"=20
            target=3DFIG2>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG><B>Fig. 2.</B></STRONG> =
The roles=20
            of PDGF and bFGF on C6 SP cells. C6 cells were cultured in =
FCS=20
            (<I>A</I>) or serum-free medium with bFGF (<I>B</I>), PDGF =
(C), or=20
            bFGF plus PDGF (<I>D</I>) for 3 wk and were then =
photographed while=20
            alive in an inverted phase-contrast microscope. C6 SP cells =
were=20
            cultured for 3 wk in FCS (<I>E</I>) or serum-free medium =
with bFGF=20
            (<I>F</I>), PDGF (<I>G</I>), or both (<I>H</I>) and were =
analyzed by=20
            flow cytometry as shown in <A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG1">Fig.=20
            1</A>. (<I>I</I>) C6 cells were cultured in FCS (<IMG =
alt=3D{circ}=20
            src=3D"http://www.pnas.org/math/cir.gif" border=3D0>), bFGF =
(<IMG=20
            alt=3D{blacktriangleup} =
src=3D"http://www.pnas.org/math/utrif.gif"=20
            border=3D0>), PDGF (<IMG alt=3D{blacksquare}=20
            src=3D"http://www.pnas.org/math/squf.gif" border=3D0>), or =
bFGF plus=20
            PDGF (<IMG alt=3D{bullet} =
src=3D"http://www.pnas.org/math/bullet.gif"=20
            border=3D0>) for the indicated times, and the proportion of =
SP cells=20
            was analyzed by flow cytometry. (<I>J</I>) C6 cells were =
cultured as=20
            in <I>A</I>=96<I>D</I> for 3 wk, and then the expression of=20
            <I>bcrp1</I>, <I>mdr1</I>, or <I>g3pdh</I> mRNAs was =
analyzed by=20
            RT-PCR. All experiments were repeated at least three times =
with=20
            similar results. (Scale bar in <I>D</I>, 100 =B5m.)
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER><SUP>=
</SUP>
<P>It was shown previously that BCRP1, which is a =
verapamil-sensitive<SUP>=20
</SUP>ABC transporter, exports the Hoechst 33342 from some types of<SUP> =

</SUP>SP cells (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF21">21</A>, <A =

href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF22">22</A>, <A =

href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF29">29</A>). =
We,=20
therefore, examined the expression<SUP> </SUP>of <I>bcrp1</I> mRNA, as =
well as=20
<I>mdr1</I> mRNA, which encodes another ABC<SUP> </SUP>transporter, in =
C6 cells=20
cultured in the four conditions described<SUP> </SUP>above. As shown in =
<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG2">Fig. 2 =
<I>J</I></A>,=20
<I>bcrp1</I> mRNA expression was detected<SUP> </SUP>in the presence of =
both=20
PDGF and bFGF but not in FCS or in bFGF<SUP> </SUP>or PDGF alone. In =
contrast,=20
<I>mdr1</I> mRNA was expressed in FCS,<SUP> </SUP>bFGF, or bFGF plus =
PDGF,=20
although it was not expressed in PDGF<SUP> </SUP>alone. Together, these =
data=20
suggest that BCRP1, but not MDR1,<SUP> </SUP>is responsible for the SP =
character=20
of some C6 cells, as reported<SUP> </SUP>for some other types of SP =
cells (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF21">21</A>, <A =

href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF22">22</A>, <A =

href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF29">29</A>).<SU=
P> </SUP>
<P>To investigate the individual roles of PDGF and bFGF in =
expanding<SUP>=20
</SUP>C6 SP cells, we cultured C6 cells in either bFGF or PDGF for<SUP> =
</SUP>2=20
wk and then in bFGF plus PDGF for an additional 2 wk. We then<SUP> =
</SUP>stained=20
the cells with Hoechst 33342 and analyzed them by flow<SUP> =
</SUP>cytometry. As=20
shown in <A =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG3">Fig.=20
3<I>B</I></A>, 1.8% of the cells cultured in<SUP> </SUP>bFGF and then in =
bFGF=20
plus PDGF were SP cells. By contrast,<SUP> </SUP>although there seemed =
to be SP=20
cells after culturing in PDGF<SUP> </SUP>and then in bFGF plus PDGF, =
these cells=20
were still seen when<SUP> </SUP>stained in the presence of verapamil (<A =

href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG3">Fig. =
3<I>A</I></A>=20
<I>Lower</I>), indicating<SUP> </SUP>that they were not bona fide SP =
cells. We=20
also examined the<SUP> </SUP>expression of both <I>bcrp1</I> and =
<I>mdr1</I>=20
mRNA in C6 cells cultured<SUP> </SUP>under these two conditions. As =
shown in <A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG3">Fig. =
3<I>D</I></A>,=20
we detected<SUP> </SUP><I>bcrp1</I> mRNA in the cells that were cultured =
in bFGF=20
and then<SUP> </SUP>in PDGF plus bFGF, but we could not do so in the =
cells=20
cultured<SUP> </SUP>in PDGF and then in PDGF plus bFGF; by contrast, we =
could=20
detect<SUP> </SUP><I>mdr1</I> mRNA in both conditions. It is possible,=20
therefore, that<SUP> </SUP>bFGF on its own maintains C6 SP cells at an=20
undetectable low<SUP> </SUP>level and that PDGF stimulates the =
proliferation of=20
these cells.<SUP> </SUP>
<P><A name=3DFIG3><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781/FIG3"><IMG=20
            height=3D95 alt=3D" " hspace=3D10=20
            =
src=3D"http://www.pnas.org/content/vol101/issue3/images/small/zpq00204344=
10003.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (36K):<BR><NOBR><A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781/FIG3">[in this=20
            window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG3', 590, 408); =
this.href=3D'/cgi/content-nw/full/101/3/781/FIG3'"=20
            =
href=3D"http://www.pnas.org/cgi/content-nw/full/101/3/781/FIG3"=20
            target=3DFIG3>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG><B>Fig. 3.</B></STRONG> =
Different=20
            roles of bFGF and PDGF on C6 SP cells. C6 cells were =
cultured in=20
            PDGF (<I>A</I>), bFGF (<I>B</I>), or both (<I>C</I>) for 2 =
wk and=20
            then expanded in bFGF plus PDGF for an additional 2 wk. They =
were=20
            then analyzed by flow cytometry as described for <A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG1">Fig.=20
            1</A>. (<I>D</I>) C6 cells were cultured as shown in=20
            <I>A</I>=96<I>C,</I> and the expression of <I>bcrp1</I>, =
<I>mdr1</I>,=20
            or <I>g3pdh</I> mRNAs was analyzed by RT-PCR. All =
experiments were=20
            repeated at least three times with similar results.
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER><SUP>=
</SUP>
<P><B>C6 SP Cells Can Repopulate both SP and Non-SP C6 Cells.</B> To=20
compare<SUP> </SUP>the ability of C6 SP cells with the ability of non-SP =

cells<SUP> </SUP>to produce SP cells, we cultured C6 cells without FCS =
and=20
in<SUP> </SUP>PDGF plus bFGF for 2 wk, stained them with Hoechst 33342, =
and<SUP>=20
</SUP>sorted them into SP and non-SP fractions by flow cytometry,<SUP> =
</SUP>and=20
then we expanded the SP and non-SP cells separately in the<SUP> =
</SUP>same=20
medium for an additional 2 wk. As they proliferated, the<SUP> =
</SUP>cells in the=20
two populations had different morphologies. The<SUP> </SUP>cells in the =
SP=20
cultures formed floating spheres (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG4">Fig.=20
4<I>A</I></A>),<SUP> </SUP>whereas the cells in the non-SP cultures =
remained=20
attached to<SUP> </SUP>the culture dishes and had a fibroblast-like =
morphology=20
(<A =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG4">Fig.<SUP>=20
</SUP>4<I>B</I></A>). When we restained the cells with Hoechst 33342 and =

reanalyzed<SUP> </SUP>them by flow cytometry, we found that the cultures =

initiated<SUP> </SUP>with SP cells contained both SP and non-SP cells, =
whereas=20
the<SUP> </SUP>cultures initiated with non-SP cells contained only =
non-SP=20
cells<SUP> </SUP>(<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG4">Fig. =
4<I>C</I></A>).=20
These data are consistent with previous findings<SUP> </SUP>that only =
the SP=20
cells in primary neurospheres can produce both<SUP> </SUP>SP and non-SP =
cells in=20
culture (<A =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF30">30</A>).=20
Furthermore, when single<SUP> </SUP>FACS-sorted SP cells were cultured =
alone in=20
the same medium<SUP> </SUP>in a well of a 98-well culture plate, <IMG=20
alt=3D{approx} src=3D"http://www.pnas.org/math/ap.gif" border=3D0>70% of =
the cells=20
proliferated<SUP> </SUP>and reformed floating spheres; in contrast, =
single=20
non-SP cells<SUP> </SUP>cultured in the same way proliferated much more =
slowly,=20
and<SUP> </SUP>almost all of the cells died by 3 wk (data not shown). =
Thus,<SUP>=20
</SUP>apparently C6 SP cells, but not non-SP cells, can form =
floating<SUP>=20
</SUP>spheres, proliferate extensively, and produce C6 SP cells in<SUP>=20
</SUP>culture.<SUP> </SUP>
<P><A name=3DFIG4><!-- null --></A><BR clear=3Dall>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"95%">
  <TBODY>
  <TR bgColor=3D#e1e1e1>
    <TD>
      <TABLE cellSpacing=3D2 cellPadding=3D2>
        <TBODY>
        <TR bgColor=3D#e1e1e1>
          <TD vAlign=3Dtop align=3Dmiddle bgColor=3D#ffffff><A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781/FIG4"><IMG=20
            height=3D138 alt=3D" " hspace=3D10=20
            =
src=3D"http://www.pnas.org/content/vol101/issue3/images/small/zpq00204344=
10004.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (61K):<BR><NOBR><A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781/FIG4">[in this=20
            window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG4', 590, 504); =
this.href=3D'/cgi/content-nw/full/101/3/781/FIG4'"=20
            =
href=3D"http://www.pnas.org/cgi/content-nw/full/101/3/781/FIG4"=20
            target=3DFIG4>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG><B>Fig. 4.</B></STRONG> =
SP cells=20
            in the C6 glioma cell line can generate both SP and non-SP =
C6 cells.=20
            C6 cells were cultured in bFGF plus PDGF for 2 wk and then =
sorted by=20
            flow cytometry as described for <A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG1">Fig.=20
            1</A>. The SP (<I>A</I>) and non-SP (<I>B</I>) cells were =
then=20
            cultured separately in the same conditions for an additional =
2 wk.=20
            The cells were then photographed while alive and analyzed by =
flow=20
            cytometry (<I>C</I>) as shown in <A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG1">Fig.=20
            1</A>. (Scale bar in <I>B</I>, 100 =B5m.)
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER><SUP>=
</SUP>
<P><B>C6SP Cells Can Produce both Neurons and Glia in Culture.</B> =
To<SUP>=20
</SUP>explore the developmental potential of C6 SP cells, we sorted<SUP> =

</SUP>SP cells, cultured them for 1 or 10 d in PDGF plus bFGF on=20
ornithine/fibronectin-coated<SUP> </SUP>chamber slides, and then =
immunolabeled=20
them for neuronal and<SUP> </SUP>glial markers. After 1 d, &gt;90% of =
the cells=20
were labeled<SUP> </SUP>for the NSC marker nestin (92 =B1 2%), but none =
were=20
labeled<SUP> </SUP>for the neuronal markers MAP2 or <IMG alt=3D{beta}=20
src=3D"http://www.pnas.org/math/beta.gif" border=3D0>-III tubulin or the =

astrocyte<SUP> </SUP>marker GFAP (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG5">Fig. =
5<I>A</I></A>),=20
suggesting that C6 SP cells might be<SUP> </SUP>undifferentiated =
NSC-like cells.=20
After 10 d, however, <IMG alt=3D{approx} =
src=3D"http://www.pnas.org/math/ap.gif"=20
border=3D0>70% were<SUP> </SUP>immunolabeled for <IMG alt=3D{beta}=20
src=3D"http://www.pnas.org/math/beta.gif" border=3D0>-III tubulin, <IMG =
alt=3D{approx}=20
src=3D"http://www.pnas.org/math/ap.gif" border=3D0>5% for MAP2, and <IMG =

alt=3D{approx} src=3D"http://www.pnas.org/math/ap.gif" border=3D0>7% for =
GFAP<SUP>=20
</SUP>(<A =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG5">Fig.=20
5<I>B</I></A>). Thus, C6 SP cells can apparently generate both =
neurons<SUP>=20
</SUP>and glial cells in culture.<SUP> </SUP>
<P><A name=3DFIG5><!-- 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://www.pnas.org/cgi/content/full/101/3/781/FIG5"><IMG=20
            height=3D200 alt=3D" " hspace=3D10=20
            =
src=3D"http://www.pnas.org/content/vol101/issue3/images/small/zpq00204344=
10005.gif"=20
            width=3D120 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (24K):<BR><NOBR><A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781/FIG5">[in this=20
            window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG5', 414, 640); =
this.href=3D'/cgi/content-nw/full/101/3/781/FIG5'"=20
            =
href=3D"http://www.pnas.org/cgi/content-nw/full/101/3/781/FIG5"=20
            target=3DFIG5>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG><B>Fig. 5.</B></STRONG> =
C6 SP=20
            cells can differentiate into both neurons and glia. C6 SP =
cells were=20
            prepared as described for <A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG4">Fig.=20
            4<I>A</I></A> and then cultured in serum-free medium with =
bFGF plus=20
            PDGF on ornithine/fibronectin-coated chamber slides for 1 =
(<I>A</I>)=20
            or 10 (<I>B</I>) d. Cells were then immunolabeled for =
neuronal and=20
            glial markers. (Scale bar in <I>B</I>, 30 =B5m.)
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER><SUP>=
</SUP>
<P><B>The Malignancy of C6 Cells in Vivo Is Largely Dependent on =
the<SUP>=20
</SUP>SP Cells.</B> To address whether SP and non-SP C6 cells differ =
in<SUP>=20
</SUP>their malignancy, we sorted C6 cells growing in PDGF plus =
bFGF<SUP>=20
</SUP>into SP and non-SP cells, expanded them in the same medium =
for<SUP>=20
</SUP>1 wk, and then injected 10<SUP>5</SUP> cells from either =
population=20
i.p.<SUP> </SUP>into nude mice. After 18 d, all mice injected with cells =

from<SUP> </SUP>the SP cultures showed intraabdominal hemorrhages (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG6">Fig. 6 =
<I>A</I><SUP>=20
</SUP>and <I>B</I></A>) and tumor invasion into the mesentery (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG6">Fig. =
6<I>C</I></A>,=20
right),<SUP> </SUP>uterus (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG6">Fig. =
6<I>D</I></A>,=20
right) and lymph nodes. In four of six mice,<SUP> </SUP>there was also =
tumor=20
invasion into the lungs (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG6">Fig. =
6<I>E</I></A>,=20
right).<SUP> </SUP>In contrast, after the same period, the cells from =
non-SP=20
cultures<SUP> </SUP>had not formed tumors that invaded into these =
tissues,=20
although<SUP> </SUP>we detected one s.c. tumor (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG6">Fig. =
6<I>A</I></A>)=20
and an occasional small<SUP> </SUP>metastasis in mesenteric lymph nodes =
(<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG6">Fig. =
6<I>C</I></A>,=20
left, arrow).<SUP> </SUP>Thus, much of the malignancy of the C6 line =
apparently=20
depends<SUP> </SUP>on SP cells.<SUP> </SUP>
<P><A name=3DFIG6><!-- 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://www.pnas.org/cgi/content/full/101/3/781/FIG6"><IMG=20
            height=3D80 alt=3D" " hspace=3D10=20
            =
src=3D"http://www.pnas.org/content/vol101/issue3/images/small/zpq00204344=
10006.gif"=20
            width=3D200 vspace=3D5 border=3D2></A><BR><STRONG>View =
larger=20
            version</STRONG> (50K):<BR><NOBR><A=20
            =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781/FIG6">[in this=20
            window]</A><BR><A=20
            onmouseover=3D"window.status=3D'View figure in a separate =
window'; return true"=20
            onclick=3D"startTarget('FIG6', 590, 375); =
this.href=3D'/cgi/content-nw/full/101/3/781/FIG6'"=20
            =
href=3D"http://www.pnas.org/cgi/content-nw/full/101/3/781/FIG6"=20
            target=3DFIG6>[in a new window]</A><BR>&nbsp;</NOBR> </TD>
          <TD vAlign=3Dtop align=3Dleft><STRONG><B>Fig. 6.</B></STRONG> =
Evidence=20
            of malignancy of C6 SP cells <I>in vivo</I>. SP or non-SP C6 =
cells=20
            (10<SUP>5</SUP>) were injected i.p. into 4-wk-old female =
nude mice=20
            (<I>A</I>, right and left mice, respectively). The mice were =
killed=20
            18 d later. (<I>B</I>=96<I>E</I>) The hematocrit was =
measured=20
            (<I>B</I>), and tumor tissue in the mesentery (<I>C</I>), =
uterus=20
            (<I>D</I>), and lung (<I>E</I>) was photographed (right, =
SP-injected=20
            tissue; left, non-SP-injected tissue). Frozen sections of =
the tumors=20
            in the mesentery in SP-injected mice were immunolabeled for =
nestin=20
            (<I>F</I>), GFAP (<I>G</I>), or low molecular weight =
neurofilament=20
            (NF-L; <I>H</I>). The sections were labeled also with =
Hoechst 33342=20
            (blue) to identify nuclei. (Scale bar in <I>H</I>, 50 =B5m.)
            =
<P></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE></CENTER><SUP>=
</SUP>
<P>To determine whether C6 cells could produce neurons and glia<SUP> =
</SUP><I>in=20
vivo</I>, we fixed the tumor-bearing tissues in 4% =
paraformaldehyde,<SUP>=20
</SUP>cut frozen sections, and immunolabeled them for neuronal and<SUP>=20
</SUP>glial markers. As shown in <A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG6">Fig. 6</A>, =
<IMG=20
alt=3D{approx} src=3D"http://www.pnas.org/math/ap.gif" border=3D0>35% of =
the cells in=20
the tumors<SUP> </SUP>were immunolabeled for nestin (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG6">Fig. =
6<I>F</I></A>),=20
<IMG alt=3D{approx} src=3D"http://www.pnas.org/math/ap.gif" =
border=3D0>30% for GFAP=20
(<A =
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG6">Fig.<SUP>=20
</SUP>6<I>G</I></A>), and <IMG alt=3D{approx}=20
src=3D"http://www.pnas.org/math/ap.gif" border=3D0>15% for the neuronal =
marker NF-L=20
(low molecular weight<SUP> </SUP>neurofilament) (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#FIG6">Fig. =
6<I>H</I></A>),=20
suggesting that C6 SP cells can differentiate<SUP> </SUP>into both =
neurons and=20
glia <I>in vivo</I>.<SUP> </SUP>
<P><A name=3DSEC3><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/rarrow.gif"=20
    width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Discussion </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://www.pnas.org/cgi/content/full/101/3/781#top"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Top<BR></A><A=20
      href=3D"http://www.pnas.org/cgi/content/full/101/3/781#ABS"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      href=3D"http://www.pnas.org/cgi/content/full/101/3/781#SEC1"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Materials and Methods<BR></A><A=20
      href=3D"http://www.pnas.org/cgi/content/full/101/3/781#SEC2"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Results<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.pnas.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      color=3D#464c53>Discussion</FONT><BR><A=20
      href=3D"http://www.pnas.org/cgi/content/full/101/3/781#BIBL"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/darrow.gif" width=3D11=20
      =
border=3D0>References<BR></A></FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>A=
lthough=20
the concept of cancer stem cells has been around for<SUP> </SUP>many =
years (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF31">31</A>=96<A=
=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF33">33</A>), =
there has=20
been surprisingly little<SUP> </SUP>attention paid to them in recent =
years. Now,=20
however, there<SUP> </SUP>is increasing evidence that at least some =
cancers=20
contain stem<SUP> </SUP>cells that are largely responsible for the =
malignancy of=20
the<SUP> </SUP>cancer. This possibility has been shown, for example, for =

acute<SUP> </SUP>myeloid leukemia (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF34">34</A>) =
and breast=20
carcinoma (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF35">35</A>). =
Cancer=20
stem<SUP> </SUP>cells are potentially extremely important because it is=20
likely<SUP> </SUP>that they are often responsible for recurrences that =
occur=20
after<SUP> </SUP>treatment. Thus, for cancer therapy to be curative, it=20
probably<SUP> </SUP>must eliminate these cells, which is why it is =
important=20
to<SUP> </SUP>identify and study cancer stem cells.<SUP> </SUP>
<P>Our findings suggest that cancer stem cells may be present also<SUP> =
</SUP>in=20
many cancer cell lines in culture, even when they have been<SUP>=20
</SUP>maintained for many years. We can detect an SP in four of the<SUP> =

</SUP>six cancer cell lines that we have tested, and in most normal<SUP> =

</SUP>tissues, the stem cells are found in the SP. We find that the<SUP> =

</SUP>SP of the C6 glioma line, which is only 0.4% of the cells =
maintained<SUP>=20
</SUP>in serum, has a number of characteristics that are expected<SUP> =
</SUP>of=20
cancer stem cells. The SP cells in culture can self-renew<SUP> </SUP>and =
produce=20
both SP and non-SP C6 cells, whereas the non-SP<SUP> </SUP>cells under =
the same=20
culture conditions can produce non-SP cells<SUP> </SUP>only. Also, the =
C6 SP=20
cells in culture can form neurospheres<SUP> </SUP>and produce neurons as =
well as=20
glial cells, suggesting that<SUP> </SUP>they have NSC-like properties. =
Finally,=20
they produce tumors<SUP> </SUP>in nude mice with high efficiency, =
whereas the=20
non-SP C6 cells<SUP> </SUP>do not.<SUP> </SUP>
<P>Besides providing further evidence for the existence of cancer<SUP>=20
</SUP>stem cells, our finding that cancer stem cells can be =
enriched<SUP>=20
</SUP>by isolating the SP in some cancer cell lines has a number of<SUP> =

</SUP>important implications. It may, for example, provide a simple<SUP> =

</SUP>and general strategy for isolating cancer stem cells. Because<SUP> =

</SUP>stem cells in any tissue are usually present in very small =
numbers,<SUP>=20
</SUP>they are difficult to identify and even more difficult to =
isolate.<SUP>=20
</SUP>There is a pressing need for methods to identify and isolate<SUP>=20
</SUP>cancer stem cells so that their properties, including their<SUP>=20
</SUP>sensitivity to various anti-cancer therapeutic agents, may be<SUP> =

</SUP>characterized.<SUP> </SUP>
<P>Our findings that cancer SP cells can be maintained indefinitely<SUP> =

</SUP>in permanent cancer cell lines raise the possibility that =
these<SUP>=20
</SUP>cell lines may provide attractive models for studying the =
molecular<SUP>=20
</SUP>basis that defines stem cells. It seems likely that most of<SUP> =
</SUP>the=20
stem cells and the other cells in a particular cancer cell<SUP> =
</SUP>line=20
contain the same mutations, including the activation of<SUP> =
</SUP>specific=20
protooncogenes and the loss of specific tumor-suppressor<SUP> =
</SUP>genes, but=20
these changes are apparently not enough to make every<SUP> </SUP>cancer =
cell a=20
stem cell. The difference between the stem cells<SUP> </SUP>and all of =
the other=20
cells in a cancer is likely to be epigenetic,<SUP> </SUP>and cancer cell =
lines=20
should be useful in trying to identify<SUP> </SUP>what these epigenetic=20
differences are, which is a fundamental<SUP> </SUP>question in stem cell =

biology.<SUP> </SUP>
<P>We find that the combination of PDGF and bFGF, but not either<SUP>=20
</SUP>alone, allows C6 SP cells to expand in culture, as it has =
been<SUP>=20
</SUP>shown previously that both mitogens can contribute to glial<SUP>=20
</SUP>oncogenesis. For example, inhibition of bFGF signaling was =
shown<SUP>=20
</SUP>not only to block cell proliferation but also to induce =
apoptosis<SUP>=20
</SUP>in glioma cells (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF36">36</A>, <A =

href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF37">37</A>). =
Enforced=20
expression of PDGF in either<SUP> </SUP>NSCs or GFAP-positive astrocytes =
was=20
found to induce malignant<SUP> </SUP>gliomas (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF10">10</A>, <A =

href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF11">11</A>). =
We find=20
that the two growth factors seem to<SUP> </SUP>have different roles in =
promoting=20
the proliferation of C6 SP<SUP> </SUP>cells in culture. bFGF on its own =
seems to=20
be able to maintain<SUP> </SUP>these cells but not to allow their =
expansion,=20
whereas PDGF on<SUP> </SUP>its own apparently cannot maintain them, but =
in the=20
presence<SUP> </SUP>of bFGF, helps to stimulate their =
proliferation.<SUP> </SUP>
<P>It is of interest that C6 SP cells can generate neurons as well<SUP> =
</SUP>as=20
glial cells; we and others (<A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF13">13</A>, <A =

href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF16">16</A>, <A =

href=3D"http://www.pnas.org/cgi/content/full/101/3/781#REF17">17</A>) =
showed that=20
oligodendrocyte<SUP> </SUP>precursor cells can be induced by =
extracellular=20
signals to convert<SUP> </SUP>to an NSC-like phenotype and generate =
neurons and=20
astrocytes,<SUP> </SUP>as well as oligodendrocytes. The molecular =
mechanisms=20
involved<SUP> </SUP>in this conversion are unknown. C6 cells might =
provide an=20
attractive<SUP> </SUP>model to study the molecular basis of this type of =

plasticity.<SUP> </SUP>
<P>In summary, our studies underline the importance of cancer stem<SUP>=20
</SUP>cells and suggest a simple strategy for isolating them. They<SUP>=20
</SUP>also suggest that cancer cell lines may be important models<SUP> =
</SUP>for=20
studying the basic biology of stem cells.<SUP> </SUP>
<P><A name=3DACK><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/rarrow.gif"=20
    width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      Acknowledgements </FONT></TH></TR></TBODY></TABLE>&nbsp;<BR>We =
thank Martin Raff=20
for editing the manuscript and Yuko Saiki<SUP> </SUP>for technical =
assistance=20
with flow cytometry. This work was<SUP> </SUP>supported in part by a=20
grant-in-aid from the Japan Ministry<SUP> </SUP>of Education, Science, =
Sports,=20
and Culture; the Nakajima Foundation;<SUP> </SUP>the Uehara Memorial =
Foundation;=20
the Japan Brain Foundation;<SUP> </SUP>the Higo Foundation; the Yamada =
Science=20
Foundation; and Merck<SUP> </SUP>Sharp and Dohme.<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 =
src=3D"http://www.pnas.org/icons/toc/rarrow.gif"=20
    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>Abbreviations: SP, side population; PDGF,=20
platelet-derived growth<SUP> </SUP>factor; bFGF, basic fibroblast growth =
factor;=20
NSC, neural stem<SUP> </SUP>cell; GFAP, glial fibrillary acidic protein; =
ABC,=20
ATP-binding<SUP> </SUP>cassette; MDR, multidrug-resistant; BCRP1, breast =

cancer-resistant<SUP> </SUP>protein 1; MAP2, microtubule-associated =
protein=20
2.<SUP> </SUP>
<P><A name=3DFN1><!-- null --></A><SUP><IMG alt=3D{ddagger}=20
src=3D"http://www.pnas.org/math/Dagger.gif" border=3D0></SUP> T.K. and =
T.S.=20
contributed equally to this work.<SUP> </SUP><A=20
href=3D"http://www.pnas.org/cgi/content/full/101/3/781#RFN1"><IMG =
height=3D12=20
alt=3DBack src=3D"http://www.pnas.org/icons/back.gif" width=3D12 =
border=3D0></A>
<P><A name=3DCOR1><!-- null --></A><SUP><IMG alt=3D=A7=20
src=3D"http://www.pnas.org/math/sect.gif" border=3D0></SUP> To whom =
correspondence=20
should be sent at the <SUP><IMG alt=3D{dagger}=20
src=3D"http://www.pnas.org/math/dagger.gif" border=3D0></SUP>address. =
E-mail: <SPAN=20
id=3Dem0>tk294{at}cam.ac.uk</SPAN>
<SCRIPT type=3Dtext/javascript><!--=0A=
 var u =3D "tk294", d =3D "cam.ac.uk"; =
document.getElementById("em0").innerHTML =3D '<a href=3D"mailto:' + u + =
'@' + d + '">' + u + '@' + d + '<\/a>'//--></SCRIPT>
.=20
<P><A name=3DBIBL><!-- null --></A><BR clear=3Dright>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%" bgColor=3D#e1e1e1>
  <TBODY>
  <TR>
    <TD vAlign=3Dcenter align=3Dleft width=3D"5%" bgColor=3D#ffffff><IMG =
height=3D21=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/rarrow.gif"=20
    width=3D10></TD>
    <TH vAlign=3Dcenter align=3Dleft width=3D"95%"><FONT =
size=3D+2>&nbsp;&nbsp;=20
      References </FONT></TH></TR></TBODY></TABLE>
<TABLE cellPadding=3D5 align=3Dright border=3D1>
  <TBODY>
  <TR>
    <TH align=3Dleft><FONT size=3D-1><A=20
      href=3D"http://www.pnas.org/cgi/content/full/101/3/781#top"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Top<BR></A><A=20
      href=3D"http://www.pnas.org/cgi/content/full/101/3/781#ABS"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Abstract<BR></A><A=20
      href=3D"http://www.pnas.org/cgi/content/full/101/3/781#SEC1"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Materials and Methods<BR></A><A=20
      href=3D"http://www.pnas.org/cgi/content/full/101/3/781#SEC2"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Results<BR></A><A=20
      href=3D"http://www.pnas.org/cgi/content/full/101/3/781#SEC3"><IMG =
height=3D9=20
      alt=3D" " hspace=3D5 =
src=3D"http://www.pnas.org/icons/toc/uarrow.gif" width=3D11=20
      border=3D0>Discussion<BR></A><IMG height=3D9 alt=3D" " hspace=3D5=20
      src=3D"http://www.pnas.org/icons/toc/dot.gif" width=3D11 =
border=3D0><FONT=20
      =
color=3D#464c53>References</FONT><BR></FONT></TH></TR></TBODY></TABLE>&nb=
sp;<BR>
<OL compact><A name=3DREF1><!-- null --></A>
  <LI value=3D1>Hayflick, L. (1965) <I>Exp. Cell Res.</I> <B>37,</B> =
614=96636.<!-- HIGHWIRE ID=3D"101:3:781:1" --><A=20
  =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D10.1016/0014-48=
27(65)90211-9&amp;link_type=3DDOI">[CrossRef]</A><A=20
  =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3DA19656304900009=
&amp;link_type=3DISI">[ISI]</A><A=20
  =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D14315085&amp;li=
nk_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE --><A name=3DREF2><!-- null --></A>
  <LI value=3D2>Poste, G. &amp; Greig, R. (1982) <I>Invasion =
Metastasis</I>=20
  <B>2,</B> 137=96176.<!-- HIGHWIRE ID=3D"101:3:781:2" --><A=20
  =
href=3D"http://www.pnas.org/cgi/external_ref?access_num=3D6765249&amp;lin=
k_type=3DMED">[Medline]</A>=20
<!-- /HIGHWIRE --><A name=3D""><!-- null --></A>
  <LI value=3D3>Woodruff, M. F. (1983) <I>Br. J. Cancer</I> <B>47,</B> =
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src=3D"http://www.pnas.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
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src=3D"http://cancerres.aacrjournals.org/portal_imgs/search_result.gif"=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap width=3D499><A=20
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alt=3D"Cancer Res"=20
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src=3D"http://www.pnas.org/icons/shared/searchall/journals/canres.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.pnas.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>R. P.=20
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<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D600 border=3D0>
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.pnas.org/icons/spacer.gif" width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <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
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    <TD vAlign=3Dtop noWrap width=3D499><A=20
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alt=3D"Cancer Res"=20
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src=3D"http://www.pnas.org/icons/shared/searchall/journals/canres.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.pnas.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>D.=20
      Fang, T. K. Nguyen, K. Leishear, R. Finko, A. N. Kulp, S. Hotz, P. =
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A>=20
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://physiolgenomics.physiology.org/"><IMG height=3D80=20
      alt=3D"Home page"=20
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src=3D"http://physiolgenomics.physiology.org/portal_imgs/search_result.gi=
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    <TD vAlign=3Dtop noWrap width=3D499><A=20
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src=3D"http://www.pnas.org/icons/shared/searchall/journals/physiolgenomic=
s.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.pnas.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
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      Decraene, R. Benchaouir, M.-A. Dillies, D. Israeli, S. Bortoli, C. =
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      FGF6</STRONG><BR>Physiol Genomics, October&nbsp;17,&nbsp;2005; =
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
      src=3D"http://www.pnas.org/icons/spacer.gif" width=3D25><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <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>
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    <TD vAlign=3Dtop noWrap width=3D499><A=20
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      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
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width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>M.=20
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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src=3D"http://stemcells.alphamedpress.org/portal_imgs/search_result.gif" =

      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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alt=3D"Home page"=20
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src=3D"http://ats.ctsnetjournals.org/portal_imgs/search_result.gif" =
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
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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>
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      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
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      src=3D"http://www.pnas.org/icons/shared/search/homelink.gif" =
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=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>
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    <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://www.pnas.org/icons/shared/searchall/journals/canres.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.pnas.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>D.=20
      Ponti, A. Costa, N. Zaffaroni, G. Pratesi, G. Petrangolini, D. =
Coradini,=20
      S. Pilotti, M. A. Pierotti, and M. G. Daidone<BR><STRONG>Isolation =
and In=20
      vitro Propagation of Tumorigenic Breast Cancer Cells with =
Stem/Progenitor=20
      Cell Properties</STRONG><BR>Cancer Res., July&nbsp;1,&nbsp;2005; =
65(13):=20
      5506 - 5511. <BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/abstract/65/13/5506=
">[Abstract]</A>=20
      <A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/65/13/5506">[F=
ull=20
      Text]</A> <A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/reprint/65/13/5506">[PDF]</=
A>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.pnas.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.pnas.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://carcin.oxfordjournals.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://carcin.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
      src=3D"http://www.pnas.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://carcin.oxfordjournals.org/"><IMG height=3D16 =
alt=3DCarcinogenesis=20
      =
src=3D"http://www.pnas.org/icons/shared/searchall/journals/carcin.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.pnas.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>F.=20
      Behbod and J. M. Rosen<BR><STRONG>Will cancer stem cells provide =
new=20
      therapeutic targets?</STRONG><BR>Carcinogenesis, =
April&nbsp;1,&nbsp;2005;=20
      26(4): 703 - 711. <BR><A=20
      =
href=3D"http://carcin.oxfordjournals.org/cgi/content/abstract/26/4/703">[=
Abstract]</A>=20
      <A =
href=3D"http://carcin.oxfordjournals.org/cgi/content/full/26/4/703">[Full=
=20
      Text]</A> <A=20
      =
href=3D"http://carcin.oxfordjournals.org/cgi/reprint/26/4/703">[PDF]</A> =

      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.pnas.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.pnas.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://carcin.oxfordjournals.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
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      width=3D59 vspace=3D5 border=3D1></A><BR></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://carcin.oxfordjournals.org/"><IMG height=3D16 =
alt=3DCarcinogenesis=20
      =
src=3D"http://www.pnas.org/icons/shared/searchall/journals/carcin.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
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width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>M.-H.=20
      Tai, C.-C. Chang, L.K. Olson, and J. E. Trosko<BR><STRONG>Oct4 =
expression=20
      in adult human stem cells: evidence in support of the stem cell =
theory of=20
      carcinogenesis</STRONG><BR>Carcinogenesis, =
February&nbsp;1,&nbsp;2005;=20
      26(2): 495 - 502. <BR><A=20
      =
href=3D"http://carcin.oxfordjournals.org/cgi/content/abstract/26/2/495">[=
Abstract]</A>=20
      <A =
href=3D"http://carcin.oxfordjournals.org/cgi/content/full/26/2/495">[Full=
=20
      Text]</A> <A=20
      =
href=3D"http://carcin.oxfordjournals.org/cgi/reprint/26/2/495">[PDF]</A> =

      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.pnas.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
      src=3D"http://www.pnas.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://www.genesdev.org/"><IMG height=3D80 alt=3D"Home =
page"=20
      src=3D"http://www.genesdev.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://www.pnas.org/icons/spacer.gif" width=3D5></TD>
    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://www.genesdev.org/"><IMG=20
      height=3D16 alt=3D"Genes &amp; Dev."=20
      =
src=3D"http://www.pnas.org/icons/shared/searchall/journals/genesdev.gif" =

      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.pnas.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>T.=20
      Kondo and M. Raff<BR><STRONG>Chromatin remodeling and histone =
modification=20
      in the conversion of oligodendrocyte precursors to neural stem=20
      cells</STRONG><BR>Genes &amp; Dev., December&nbsp;1,&nbsp;2004; =
18(23):=20
      2963 - 2972. <BR><A=20
      =
href=3D"http://www.genesdev.org/cgi/content/abstract/18/23/2963">[Abstrac=
t]</A>=20
      <A =
href=3D"http://www.genesdev.org/cgi/content/full/18/23/2963">[Full=20
      Text]</A> <A=20
      href=3D"http://www.genesdev.org/cgi/reprint/18/23/2963">[PDF]</A> =
<BR><IMG=20
      height=3D1 alt=3D"" src=3D"http://www.pnas.org/icons/spacer.gif" =
width=3D499>=20
      </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop align=3Dmiddle width=3D25><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://www.pnas.org/"><IMG height=3D80 alt=3D"Home page"=20
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    <TD vAlign=3Dtop noWrap width=3D499><A =
href=3D"http://www.pnas.org/"><IMG=20
      height=3D16 alt=3D"Proc. Natl. Acad. Sci. U. S. A."=20
      =
src=3D"http://www.pnas.org/icons/shared/searchall/journals/pnas.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
page"=20
      src=3D"http://www.pnas.org/icons/shared/search/homelink.gif" =
width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>J.=20
      Lotem, H. Benjamin, D. Netanely, E. Domany, and L.=20
      Sachs<BR><STRONG>Induction in myeloid leukemic cells of genes that =
are=20
      expressed in different normal tissues</STRONG><BR>PNAS,=20
      November&nbsp;9,&nbsp;2004; 101(45): 16022 - 16027. <BR><A=20
      =
href=3D"http://www.pnas.org/cgi/content/abstract/101/45/16022">[Abstract]=
</A>=20
      <A =
href=3D"http://www.pnas.org/cgi/content/full/101/45/16022">[Full=20
      Text]</A> <A =
href=3D"http://www.pnas.org/cgi/reprint/101/45/16022">[PDF]</A>=20
      <BR><IMG height=3D1 alt=3D"" =
src=3D"http://www.pnas.org/icons/spacer.gif"=20
      width=3D499> </FONT></TD>
    <TD width=3D5><IMG height=3D5 alt=3D""=20
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      <HR align=3Dleft width=3D600 color=3D#828282 noShade SIZE=3D1>
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap align=3Dmiddle width=3D61><A=20
      href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D80 =
alt=3D"Home page"=20
      =
src=3D"http://cancerres.aacrjournals.org/portal_imgs/search_result.gif"=20
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    <TD width=3D5><IMG height=3D5 alt=3D""=20
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    <TD vAlign=3Dtop noWrap width=3D499><A=20
      href=3D"http://cancerres.aacrjournals.org/"><IMG height=3D16 =
alt=3D"Cancer Res"=20
      =
src=3D"http://www.pnas.org/icons/shared/searchall/journals/canres.gif"=20
      width=3D450 vspace=3D5 border=3D0><IMG height=3D16 alt=3D"Home =
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width=3D49=20
      vspace=3D5 border=3D0></A><BR><FONT face=3Dverdana,arial,helvetica =
size=3D-1>R.=20
      Galli, E. Binda, U. Orfanelli, B. Cipelletti, A. Gritti, S. De =
Vitis, R.=20
      Fiocco, C. Foroni, F. Dimeco, and A. Vescovi<BR><STRONG>Isolation =
and=20
      Characterization of Tumorigenic, Stem-like Neural Precursors from =
Human=20
      Glioblastoma</STRONG><BR>Cancer Res., October&nbsp;1,&nbsp;2004; =
64(19):=20
      7011 - 7021. <BR><A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/abstract/64/19/7011=
">[Abstract]</A>=20
      <A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/content/full/64/19/7011">[F=
ull=20
      Text]</A> <A=20
      =
href=3D"http://cancerres.aacrjournals.org/cgi/reprint/64/19/7011">[PDF]</=
A>=20
      <BR><IMG height=3D1 alt=3D"" =
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/*=0A=
=0A=
Cross-Browser XMLHttpRequest v1.2=0A=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=0A=
=0A=
Emulate Gecko 'XMLHttpRequest()' functionality in IE and Opera. Opera =
requires=0A=
the Sun Java Runtime Environment <http://www.java.com/>.=0A=
=0A=
by Andrew Gregory=0A=
http://www.scss.com.au/family/andrew/webdesign/xmlhttprequest/=0A=
=0A=
This work is licensed under the Creative Commons Attribution License. To =
view a=0A=
copy of this license, visit =
http://creativecommons.org/licenses/by-sa/2.5/ or=0A=
send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, =
California=0A=
94305, USA.=0A=
=0A=
Attribution: Leave my name and web address in this script intact.=0A=
=0A=
Not Supported in Opera=0A=
----------------------=0A=
* user/password authentication=0A=
* responseXML data member=0A=
=0A=
Not Fully Supported in Opera=0A=
----------------------------=0A=
* async requests=0A=
* abort()=0A=
* getAllResponseHeaders(), getAllResponseHeader(header)=0A=
=0A=
*/=0A=
// IE support=0A=
if (window.ActiveXObject && !window.XMLHttpRequest) {=0A=
  window.XMLHttpRequest =3D function() {=0A=
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      'Msxml2.XMLHTTP.3.0',=0A=
      'Msxml2.XMLHTTP',=0A=
      'Microsoft.XMLHTTP');=0A=
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      try {=0A=
        return new ActiveXObject(msxmls[i]);=0A=
      } catch (e) {=0A=
      }=0A=
    }=0A=
    return null;=0A=
  };=0A=
}=0A=
// Gecko support=0A=
/* ;-) */=0A=
// Opera support=0A=
if (window.opera && !window.XMLHttpRequest) {=0A=
  window.XMLHttpRequest =3D function() {=0A=
    this.readyState =3D 0; // =
0=3Duninitialized,1=3Dloading,2=3Dloaded,3=3Dinteractive,4=3Dcomplete=0A=
    this.status =3D 0; // HTTP status codes=0A=
    this.statusText =3D '';=0A=
    this._headers =3D [];=0A=
    this._aborted =3D false;=0A=
    this._async =3D true;=0A=
    this._defaultCharset =3D 'ISO-8859-1';=0A=
    this._getCharset =3D function() {=0A=
      var charset =3D _defaultCharset;=0A=
      var contentType =3D =
this.getResponseHeader('Content-type').toUpperCase();=0A=
      val =3D contentType.indexOf('CHARSET=3D');=0A=
      if (val !=3D -1) {=0A=
        charset =3D contentType.substring(val);=0A=
      }=0A=
      val =3D charset.indexOf(';');=0A=
      if (val !=3D -1) {=0A=
        charset =3D charset.substring(0, val);=0A=
      }=0A=
      val =3D charset.indexOf(',');=0A=
      if (val !=3D -1) {=0A=
        charset =3D charset.substring(0, val);=0A=
      }=0A=
      return charset;=0A=
    };=0A=
    this.abort =3D function() {=0A=
      this._aborted =3D true;=0A=
    };=0A=
    this.getAllResponseHeaders =3D function() {=0A=
      return this.getAllResponseHeader('*');=0A=
    };=0A=
    this.getAllResponseHeader =3D function(header) {=0A=
      var ret =3D '';=0A=
      for (var i =3D 0; i < this._headers.length; i++) {=0A=
        if (header =3D=3D '*' || this._headers[i].h =3D=3D header) {=0A=
          ret +=3D this._headers[i].h + ': ' + this._headers[i].v + '\n';=0A=
        }=0A=
      }=0A=
      return ret;=0A=
    };=0A=
    this.getResponseHeader =3D function(header) {=0A=
      var ret =3D getAllResponseHeader(header);=0A=
      var i =3D ret.indexOf('\n');=0A=
      if (i !=3D -1) {=0A=
        ret =3D ret.substring(0, i);=0A=
      }=0A=
      return ret;=0A=
    };=0A=
    this.setRequestHeader =3D function(header, value) {=0A=
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    };=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=
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      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=
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      case 'msxml2.xmlhttp.5.0':=0A=
        return new XMLHttpRequest();=0A=
    }=0A=
    return null;=0A=
  };=0A=
}=0A=

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 * javascript/ajax/utility.js=0A=
 *=0A=
 * Utility functions for working with XMLHttpRequest data.=0A=
 *=0A=
 * Copyright 2006 Board of Trustees of the Leland Stanford Junior =
University.=0A=
 =
*************************************************************************=
***/=0A=
=0A=
/*=0A=
 * Copy XML nodes into an HTMLElement. This effectively=0A=
 * clones XML markup which uses XHTML naming conventions=0A=
 * into an HTML DOM.=0A=
 */=0A=
function copy_xml_to_html(src, dst) {=0A=
  if (src.nodeType =3D=3D 1) { /* Node.ELEMENT_NODE */=0A=
    var e =3D document.createElement(src.nodeName);=0A=
    for (var i =3D 0; i < src.childNodes.length; i++) {=0A=
	  copy_xml_to_html(src.childNodes[i], e);=0A=
    }=0A=
    for (var i =3D 0; i < src.attributes.length; i++) {=0A=
      var n =3D src.attributes[i].name;=0A=
      var v =3D unescape_xml_string(src.attributes[i].value);      =0A=
      e.setAttribute(n, v);=0A=
      if (n =3D=3D "class") {=0A=
        e.className =3D v;=0A=
      }=0A=
      else if (n =3D=3D "style") {=0A=
        set_css_style(v, e, "");=0A=
      }=0A=
    }=0A=
    dst.appendChild(e);=0A=
  }=0A=
  else if (src.nodeType =3D=3D 3) { /* Node.TEXT_NODE */=0A=
    dst.appendChild(document.createTextNode(src.nodeValue));=0A=
  }=0A=
}=0A=
=0A=
/* =0A=
 * It is unclear that this is the right thing to be calling=0A=
 * from copy_xml_to_html, but it appears that Safari decides=0A=
 * to convert &amp; to the NCR &#35;, and then encodes that=0A=
 * NCR to &%26%2338;.  So, I'm going to treat the DOM Attr=0A=
 * value as a plain string, and run our XML string input=0A=
 * through the decoding routine below.=0A=
 */=0A=
function unescape_xml_string(s) {=0A=
  return s.replace(/&apos;/g, "'")=0A=
          .replace(/&#39;/g,  "'")=0A=
          .replace(/&quot;/g, "\"")=0A=
          .replace(/&#34;/g,  "\"")=0A=
          .replace(/&gt;/g,   ">")=0A=
          .replace(/&#62;/g,  ">")=0A=
          .replace(/&lt;/g,   "<")=0A=
          .replace(/&#60;/g,  "<")=0A=
          .replace(/&amp;/g,  "&")=0A=
          .replace(/&#38;/g,  "&");=0A=
}=0A=
=0A=
/*=0A=
 * Parse set of CSS rules and apply them to an element.=0A=
 * This is quite horrifying, but I'm unable to determine=0A=
 * how else to handle this with IE 6.  FireFox and other=0A=
 * sane browsers let you simply set the style attribute=0A=
 * or use e.style.setProperty(rule, value, priority),=0A=
 * IE 6 appears to have neither of these capabilities..=0A=
 */=0A=
function set_css_style(css, e, priority) {=0A=
  var rules =3D css.split(";");=0A=
  for (var i =3D 0; i < rules.length; i++) {=0A=
    var nvpair =3D rules[i].split(":");=0A=
    if (nvpair.length =3D=3D 2) {=0A=
      try {=0A=
        var name  =3D nvpair[0]; /* style attribute */=0A=
        var value =3D nvpair[1]; /* attribute value */=0A=
  =0A=
        /*=0A=
         * For each possible style attribute, set the=0A=
         * appropriate style property in the element.=0A=
         */=0A=
        if (name =3D=3D "background") {=0A=
           e.style.background =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-attachment") {=0A=
          e.style.backgroundAttachment =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-color") {=0A=
          e.style.backgroundColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-image") {=0A=
          e.style.backgroundImage =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position") {=0A=
          e.style.backgroundPosition =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position-x") {=0A=
          e.style.backgroundPositionX =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-position-y") {=0A=
          e.style.backgroundPositionY =3D value;=0A=
        }=0A=
        else if (name =3D=3D "background-repeat") {=0A=
          e.style.backgroundRepeat =3D value;=0A=
        }=0A=
        else if (name =3D=3D "behavior") {=0A=
          e.style.behavior =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border") {=0A=
          e.style.border =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom") {=0A=
          e.style.borderBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-color") {=0A=
          e.style.borderBottomColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-style") {=0A=
          e.style.borderBottomStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-bottom-width") {=0A=
          e.style.borderBottomWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-collapse") {=0A=
          e.style.borderCollapse =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-color") {=0A=
          e.style.borderColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left") {=0A=
          e.style.borderLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left-color") {=0A=
          e.style.borderLeftColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left-style") {=0A=
          e.style.borderLeftStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-left-width") {=0A=
          e.style.borderLeftWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right") {=0A=
          e.style.borderRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right-color") {=0A=
          e.style.borderRightColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right-style") {=0A=
          e.style.borderRightStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-right-width") {=0A=
          e.style.borderRightWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-style") {=0A=
          e.style.borderStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top") {=0A=
          e.style.borderTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top-color") {=0A=
          e.style.borderTopColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top-style") {=0A=
          e.style.borderTopStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-top-width") {=0A=
          e.style.borderTopWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "border-width") {=0A=
          e.style.borderWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "bottom") {=0A=
          e.style.bottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "clear") {=0A=
          e.style.clear =3D value;=0A=
        }=0A=
        else if (name =3D=3D "clip") {=0A=
          e.style.clip =3D value;=0A=
        }=0A=
        else if (name =3D=3D "color") {=0A=
          e.style.color =3D value;=0A=
        }=0A=
        else if (name =3D=3D "cssText") {=0A=
          e.style.Sets =3D value;=0A=
        }=0A=
        else if (name =3D=3D "cursor") {=0A=
          e.style.cursor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "direction") {=0A=
          e.style.direction =3D value;=0A=
        }=0A=
        else if (name =3D=3D "display") {=0A=
          e.style.display =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font") {=0A=
          e.style.font =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-family") {=0A=
          e.style.fontFamily =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-size") {=0A=
          e.style.fontSize =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-style") {=0A=
          e.style.fontStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-variant") {=0A=
          e.style.fontVariant =3D value;=0A=
        }=0A=
        else if (name =3D=3D "font-weight") {=0A=
          e.style.fontWeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "height") {=0A=
          e.style.height =3D value;=0A=
        }=0A=
        else if (name =3D=3D "ime-mode") {=0A=
          e.style.imeMode =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-flow") {=0A=
          e.style.layoutFlow =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid") {=0A=
          e.style.layoutGrid =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid-char") {=0A=
          e.style.layoutGridChar =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid-line") {=0A=
          e.style.layoutGridLine =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid-mode") {=0A=
          e.style.layoutGridMode =3D value;=0A=
        }=0A=
        else if (name =3D=3D "layout-grid-type") {=0A=
          e.style.layoutGridType =3D value;=0A=
        }=0A=
        else if (name =3D=3D "left") {=0A=
          e.style.left =3D value;=0A=
        }=0A=
        else if (name =3D=3D "letter-spacing") {=0A=
          e.style.letterSpacing =3D value;=0A=
        }=0A=
        else if (name =3D=3D "line-break") {=0A=
          e.style.lineBreak =3D value;=0A=
        }=0A=
        else if (name =3D=3D "line-height") {=0A=
          e.style.lineHeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "list-style") {=0A=
          e.style.listStyle =3D value;=0A=
        }=0A=
        else if (name =3D=3D "list-style-image") {=0A=
          e.style.listStyleImage =3D value;=0A=
        }=0A=
        else if (name =3D=3D "list-style-position") {=0A=
          e.style.listStylePosition =3D value;=0A=
        }=0A=
        else if (name =3D=3D "list-style-type") {=0A=
          e.style.listStyleType =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin") {=0A=
          e.style.margin =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin-bottom") {=0A=
          e.style.marginBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin-left") {=0A=
          e.style.marginLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin-right") {=0A=
          e.style.marginRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "margin-top") {=0A=
          e.style.marginTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "min-height") {=0A=
          e.style.minHeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "overflow") {=0A=
          e.style.overflow =3D value;=0A=
        }=0A=
        else if (name =3D=3D "overflow-x") {=0A=
          e.style.overflowX =3D value;=0A=
        }=0A=
        else if (name =3D=3D "overflow-y") {=0A=
          e.style.overflowY =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding") {=0A=
          e.style.padding =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding-bottom") {=0A=
          e.style.paddingBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding-left") {=0A=
          e.style.paddingLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding-right") {=0A=
          e.style.paddingRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "padding-top") {=0A=
          e.style.paddingTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "page-break-after") {=0A=
          e.style.pageBreakAfter =3D value;=0A=
        }=0A=
        else if (name =3D=3D "page-break-before") {=0A=
          e.style.pageBreakBefore =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelBottom") {=0A=
          e.style.pixelBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelHeight") {=0A=
          e.style.pixelHeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelLeft") {=0A=
          e.style.pixelLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelRight") {=0A=
          e.style.pixelRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelTop") {=0A=
          e.style.pixelTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "pixelWidth") {=0A=
          e.style.pixelWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posBottom") {=0A=
          e.style.posBottom =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posHeight") {=0A=
          e.style.posHeight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "position") {=0A=
          e.style.position =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posLeft") {=0A=
          e.style.posLeft =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posRight") {=0A=
          e.style.posRight =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posTop") {=0A=
          e.style.posTop =3D value;=0A=
        }=0A=
        else if (name =3D=3D "posWidth") {=0A=
          e.style.posWidth =3D value;=0A=
        }=0A=
        else if (name =3D=3D "right") {=0A=
          e.style.right =3D value;=0A=
        }=0A=
        else if (name =3D=3D "ruby-align") {=0A=
          e.style.rubyAlign =3D value;=0A=
        }=0A=
        else if (name =3D=3D "ruby-overhang") {=0A=
          e.style.rubyOverhang =3D value;=0A=
        }=0A=
        else if (name =3D=3D "ruby-position") {=0A=
          e.style.rubyPosition =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-3dlight-color") {=0A=
          e.style.scrollbar3dLightColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-arrow-color") {=0A=
          e.style.scrollbarArrowColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-base-color") {=0A=
          e.style.scrollbarBaseColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-darkshadow-color") {=0A=
          e.style.scrollbarDarkShadowColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-face-color") {=0A=
          e.style.scrollbarFaceColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-highlight-color") {=0A=
          e.style.scrollbarHighlightColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-shadow-color") {=0A=
          e.style.scrollbarShadowColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "scrollbar-track-color") {=0A=
          e.style.scrollbarTrackColor =3D value;=0A=
        }=0A=
        else if (name =3D=3D "float") {=0A=
          e.style.styleFloat =3D value;=0A=
        }=0A=
        else if (name =3D=3D "table-layout") {=0A=
          e.style.tableLayout =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-align") {=0A=
          e.style.textAlign =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-align-last") {=0A=
          e.style.textAlignLast =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-autospace") {=0A=
          e.style.textAutospace =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-decoration") {=0A=
          e.style.textDecoration =3D value;=0A=
        }=0A=
        else if (name =3D=3D "textDecorationBlink") {=0A=
          e.style.textDecorationBlink =3D value;=0A=
        }=0A=
        else if (name =3D=3D "textDecorationLineThrough") {=0A=
          e.style.textDecorationLineThrough =3D value;=0A=
        }=0A=
        else if (name =3D=3D "textDecorationNone") {=0A=
          e.style.textDecorationNone =3D value;=0A=
        }=0A=
        else if (name =3D=3D "textDecorationOverline") {=0A=
          e.style.textDecorationOverline =3D value;=0A=
        }=0A=
        else if (name =3D=3D "textDecorationUnderline") {=0A=
          e.style.textDecorationUnderline =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-indent") {=0A=
          e.style.textIndent =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-justify") {=0A=
          e.style.textJustify =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-kashida-space") {=0A=
          e.style.textKashidaSpace =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-overflow") {=0A=
          e.style.textOverflow =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-transform") {=0A=
          e.style.textTransform =3D value;=0A=
        }=0A=
        else if (name =3D=3D "text-underline-position") {=0A=
          e.style.textUnderlinePosition =3D value;=0A=
        }=0A=
        else if (name =3D=3D "top") {=0A=
          e.style.top =3D value;=0A=
        }=0A=
        else if (name =3D=3D "unicode-bidi") {=0A=
          e.style.unicodeBidi =3D value;=0A=
        }=0A=
        else if (name =3D=3D "vertical-align") {=0A=
          e.style.verticalAlign =3D value;=0A=
        }=0A=
        else if (name =3D=3D "visibility") {=0A=
          e.style.visibility =3D value;=0A=
        }=0A=
        else if (name =3D=3D "white-space") {=0A=
          e.style.whiteSpace =3D value;=0A=
        }=0A=
        else if (name =3D=3D "width") {=0A=
          e.style.width =3D value;=0A=
        }=0A=
        else if (name =3D=3D "word-break") {=0A=
          e.style.wordBreak =3D value;=0A=
        }=0A=
        else if (name =3D=3D "word-spacing") {=0A=
          e.style.wordSpacing =3D value;=0A=
        }=0A=
        else if (name =3D=3D "word-wrap") {=0A=
          e.style.wordWrap =3D value;=0A=
        }=0A=
        else if (name =3D=3D "writing-mode") {=0A=
          e.style.writingMode =3D value;=0A=
        }=0A=
        else if (name =3D=3D "z-index") {=0A=
          e.style.zIndex =3D value;=0A=
        }=0A=
        else if (name =3D=3D "zoom") {=0A=
          e.style.zoom =3D value;=0A=
        }=0A=
      }=0A=
      catch (e) {=0A=
        /* ignore error on attempt to set e.style.[property] */=0A=
      }=0A=
    }=0A=
  }=0A=
}=0A=

------=_NextPart_000_0002_01C70A59.FAEAAFC0
Content-Type: application/octet-stream
Content-Transfer-Encoding: quoted-printable
Content-Location: http://www.pnas.org/javascript/entrez/callback.js

/************************************************************************=
*****=0A=
 * javascript/entrez/callback.js=0A=
 *=0A=
 * Entrez Linking callback to populate content box.=0A=
 *=0A=
 * Copyright 2006 Board of Trustees of the Leland Stanford Junior =
University.=0A=
 =
*************************************************************************=
***/=0A=
=0A=
/*=0A=
 * Execute callback to fill content box with Entrez Linking information.=0A=
 */=0A=
function entrez_callback(pmid, callback_url) {=0A=
  /*=0A=
   * MSIE 5.5 and below have issues with the JavaScript=0A=
   * used for Entrez Linking. For now we have to disable=0A=
   * the callback until we can track down a proper fix=0A=
   * (or everybody sanely upgrades to version 6 or 7!).=0A=
   */=0A=
  if (navigator) {=0A=
    var appname =3D navigator.appName;=0A=
    if (appname =3D=3D "Microsoft Internet Explorer") {=0A=
      var userAgent =3D navigator["userAgent"];=0A=
      var s =3D "MSIE ";=0A=
      var n =3D -1;      =0A=
      if ((n =3D userAgent.indexOf(s)) !=3D -1) {=0A=
        var v =3D parseFloat(userAgent.substring(n+s.length));=0A=
        if (v < 6) {=0A=
          return;=0A=
        }=0A=
      }=0A=
    }=0A=
  }=0A=
=0A=
  /*=0A=
   * Acquire table row element to update, initiate callback=0A=
   * to update table with Entrez Links.=0A=
   */=0A=
  var tr =3D document.getElementById('entrez_callback_'+pmid);=0A=
  if (!tr) {=0A=
    return;=0A=
  }=0A=
  var req =3D new XMLHttpRequest();=0A=
  if (!req) {=0A=
    return;=0A=
  }=0A=
  req.onreadystatechange =3D function() {=0A=
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=3D=3D 304)) {=0A=
      var src =3D req.responseXML.documentElement;=0A=
      var dst =3D document.createDocumentFragment();=0A=
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      	copy_xml_to_html(src.childNodes[i], dst);=0A=
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      var tbl =3D tr.parentNode;=0A=
      tbl.replaceChild(dst, tr);=0A=
    }=0A=
  }=0A=
  req.open('GET', callback_url, true);=0A=
  req.send(null);=0A=
}=0A=

------=_NextPart_000_0002_01C70A59.FAEAAFC0
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 2005 Google, All Rights Reserved.=0A=
=0A=
//-- Urchin On Demand Settings ONLY=0A=
var _uacct=3D"";			// set up the Urchin Account=0A=
var _userv=3D1;			// service mode (0=3Dlocal,1=3Dremote,2=3Dboth)=0A=
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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=
=0A=
//-- UTM Campaign Tracking Settings=0A=
var _uctm=3D1;			// set campaign tracking module (1=3Don|0=3Doff)=0A=
var _ucto=3D"15768000";		// set timeout in seconds (6 month default)=0A=
var _uccn=3D"utm_campaign";	// name=0A=
var _ucmd=3D"utm_medium";		// medium (cpc|cpm|link|email|organic)=0A=
var _ucsr=3D"utm_source";		// source=0A=
var _uctr=3D"utm_term";		// term/keyword=0A=
var _ucct=3D"utm_content";	// content=0A=
var _ucid=3D"utm_id";		// id number=0A=
var _ucno=3D"utm_nooverride";	// don't override=0A=
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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"search";	_uOkw[8]=3D"q";=0A=
_uOsr[9]=3D"netscape";	_uOkw[9]=3D"s";=0A=
_uOsr[10]=3D"cnn";	_uOkw[10]=3D"query";=0A=
_uOsr[11]=3D"looksmart";	_uOkw[11]=3D"qt";=0A=
_uOsr[12]=3D"about";	_uOkw[12]=3D"terms";=0A=
_uOsr[13]=3D"mamma";	_uOkw[13]=3D"query";=0A=
_uOsr[14]=3D"alltheweb";	_uOkw[14]=3D"q";=0A=
_uOsr[15]=3D"gigablast";	_uOkw[15]=3D"q";=0A=
_uOsr[16]=3D"voila";	_uOkw[16]=3D"kw";=0A=
_uOsr[17]=3D"virgilio";	_uOkw[17]=3D"qs";=0A=
_uOsr[18]=3D"live";	_uOkw[18]=3D"q";=0A=
_uOsr[19]=3D"baidu";	_uOkw[19]=3D"wd";=0A=
_uOsr[20]=3D"alice";	_uOkw[20]=3D"qs";=0A=
_uOsr[21]=3D"seznam";	_uOkw[21]=3D"w";=0A=
_uOsr[22]=3D"yandex";	_uOkw[22]=3D"text";=0A=
_uOsr[23]=3D"najdi";	_uOkw[23]=3D"q";=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=
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var _uRno=3Dnew Array();=0A=
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"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=
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  var r=3DMath.round(Math.random()*2147483647);=0A=
  if (!_utsp || _utsp=3D=3D"") _utsp=3D"|";=0A=
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   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=
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 }=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=
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   }=0A=
  }=0A=
 } else if (window.ActiveXObject) {=0A=
  for (var ii=3D10;ii>=3D2;ii--) {=0A=
   try {=0A=
    var fl=3Deval("new =
ActiveXObject('ShockwaveFlash.ShockwaveFlash."+ii+"');");=0A=
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   }=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=
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   if (iq=3D=3D-1 && ih=3D=3D-1) f.action+=3D"?"+p;=0A=
   else if (ih=3D=3D-1) f.action+=3D"&"+p;=0A=
   else if (iq=3D=3D-1) =
f.action=3Df.action.substring(0,ih-1)+"?"+p+f.action.substring(ih);=0A=
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f.action=3Df.action.substring(0,ih-1)+"&"+p+f.action.substring(ih);=0A=
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 }=0A=
 return;=0A=
}=0A=
function __utmSetVar(v) {=0A=
 if (!v || v=3D=3D"") return;=0A=
 if (!_udo || _udo =3D=3D "") {=0A=
  _udh=3D_uDomain();=0A=
  if (_udn && _udn!=3D"") { _udo=3D" domain=3D"+_udn+";"; }=0A=
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 if (!_uVG()) return;=0A=
 var r=3DMath.round(Math.random() * 2147483647);=0A=
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expires=3DSun, 18 Jan 2038 00:00:00 GMT;"+_udo;=0A=
 var s=3D"&utmt=3Dvar&utmn=3D"+r;=0A=
 if ((_userv=3D=3D0 || _userv=3D=3D2) && _uSP()) {=0A=
  var i=3Dnew Image(1,1);=0A=
  i.src=3D_ugifpath+"?"+"utmwv=3D"+_uwv+s;=0A=
  i.onload=3Dfunction() { _uVoid(); }=0A=
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 if ((_userv=3D=3D1 || _userv=3D=3D2) && _uSP()) {=0A=
  var i2=3Dnew Image(1,1);=0A=
  =
i2.src=3D_ugifpath2+"?"+"utmwv=3D"+_uwv+s+"&utmac=3D"+_uacct+"&utmcc=3D"+=
_uGCS();=0A=
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 }=0A=
}=0A=
function _uGCS() {=0A=
 var t,c=3D"",dc=3D_ubd.cookie;=0A=
 if ((t=3D_uGC(dc,"__utma=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utma=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmb=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmb=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmc=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmc=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmx=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmx=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmz=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmz=3D"+t+";+");=0A=
 if ((t=3D_uGC(dc,"__utmv=3D"+_udh,";"))!=3D"-") =
c+=3D_uES("__utmv=3D"+t+";");=0A=
 if (c.charAt(c.length-1)=3D=3D"+") c=3Dc.substring(0,c.length-1);=0A=
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}=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=
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 return c;=0A=
}=0A=
function _uDomain() {=0A=
 if (!_udn || _udn=3D=3D"" || _udn=3D=3D"none") { _udn=3D""; return 1; }=0A=
 if (_udn=3D=3D"auto") {=0A=
  var d=3D_ubd.domain;=0A=
  if (d.substring(0,4)=3D=3D"www.") {=0A=
   d=3Dd.substring(4,d.length);=0A=
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  _udn=3Dd;=0A=
 }=0A=
 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=
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 }=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=
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  _uns=3D(_uns*1)+1;=0A=
  a=3Da.substring(0,i);=0A=
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   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=
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  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'/') {=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=

------=_NextPart_000_0002_01C70A59.FAEAAFC0--

