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Subject: ScienceDirect - Neuron : Drosophila Neuroblast Asymmetric Cell Division: Recent Advances and Implications for Stem Cell Biology
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0&amp;md5=3D2421766b3c5695698b541fea6b7574e1">Dare=20
                  to Be Different: Asymmetric Cell Division in=20
                  Droso...<BR><I>Current Biology</I></A><BR></TD></TR>
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            onmouseover=3D"InfoBubble.show('infobubble_1','mlktLink_1')" =

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                  <DIV style=3D"PADDING-LEFT: 5px; FLOAT: right"><A=20
                  onclick=3DInfoBubble.hide()><IMG=20
                  =
onmouseover=3D"javascript:this.src=3D'/scidirimg/btn_xclose_hov.gif';"=20
                  title=3DClose=20
                  =
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src=3D"http://www.sciencedirect.com/scidirimg/btn_xclose.gif"></A></DIV><=
IMG=20
                  title=3D"You are entitled to access the full text of =
this document"=20
                  height=3D14=20
                  alt=3D"You are entitled to access the full text of =
this document"=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/sci_dir/jrn_sub.gif"=20
                  width=3D12 border=3D0>&nbsp;<B>Dare to Be Different: =
Asymmetric=20
                  Cell Division in <SPAN class=3Dit>Drosophila</SPAN>, =
<SPAN=20
                  class=3Dit>C. elegans</SPAN> and =
Vertebrates</B><BR><I>Current=20
                  Biology</I>,&nbsp;<I>Volume 14, Issue =
16</I>,&nbsp;<I>24=20
                  August 2004</I>, <I>Pages R674-R685</I><BR>J=C3=B6rg =
Betschinger=20
                  and J=C3=BCrgen A. Knoblich<BR><BR><B>Abstract</B><BR>
                  <DIV class=3DmlktScroll>
                  <DIV style=3D"LINE-HEIGHT: 150%">One widespread =
mechanism for=20
                  the generation of diverse cell types is the unequal=20
                  inheritance of cell fate determinants. Several such=20
                  determinants have been identified in the fruitfly =
<SPAN=20
                  class=3Dit>Drosophila melanogaster</SPAN> and the worm =
<SPAN=20
                  class=3Dit>Caenorhabditis elegans</SPAN> and the =
molecular=20
                  machinery responsible for their asymmetric segregation =
is=20
                  beginning to be unraveled. To divide asymmetrically, =
cells=20
                  establish an axis of polarity, orient the mitotic =
spindle=20
                  along this axis and localize cell fate determinants to =
one=20
                  side of the cell. During cytokinesis, determinants are =
then=20
                  segregated into one of the two daughter cells where =
they=20
                  direct cell fate. Here, we outline the steps and =
factors that=20
                  are involved in this process in <SPAN=20
                  class=3Dit>Drosophila</SPAN> and <SPAN class=3Dit>C.=20
                  elegans</SPAN> and discuss their potential =
conservation in=20
                  vertebrates.</DIV></DIV><BR><A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6VRT-4D56PX0-M&amp;_user=3D10&amp;_coverDate=3D08%2F24%2F2004&amp;_rdoc=3D=
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ersion=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3Dfb2a24e1941c80d=
c5cd43df33487fcf5">SummaryPlus</A>=20
                  | <A=20
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B6VRT-4D56PX0-M&amp;_user=3D10&amp;_coverDate=3D08%2F24%2F2004&amp;_rdoc=3D=
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            </TD></TR></TBODY></TABLE></DIV></DIV>
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                <TD=20
                style=3D"PADDING-RIGHT: 5px; PADDING-LEFT: 5px; =
PADDING-BOTTOM: 0px; PADDING-TOP: 5px"=20
                vAlign=3Dtop><IMG title=3D"" alt=3D""=20
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src=3D"http://www.sciencedirect.com/scidirimg/bullet_square.gif"></TD>
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                  =
onmouseover=3D"InfoBubble.show('infobubble_2','mlktLink_2')"=20
                  onmouseout=3DInfoBubble.timeout()=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSN-4JJ85XW-M&amp;_user=3D10&amp;_origUdi=3DB6WSS-4KBDYF1-6&amp;_fmt=3D=
high&amp;_coverDate=3D03%2F24%2F2006&amp;_rdoc=3D1&amp;_orig=3Darticle&am=
p;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D1=
0&amp;md5=3D7824be8c074ca3dafcd6d8ba962c9557">Asymmetric=20
                  Segregation of the Tumor Suppressor Brat=20
                  Reg...<BR><I>Cell</I></A><BR></TD></TR>
              <DIV></DIV></TBODY></TABLE>
            <DIV class=3Dinfobubble id=3Dinfobubble_2=20
            onmouseover=3D"InfoBubble.show('infobubble_2','mlktLink_2')" =

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                  <DIV style=3D"PADDING-LEFT: 5px; FLOAT: right"><A=20
                  onclick=3DInfoBubble.hide()><IMG=20
                  =
onmouseover=3D"javascript:this.src=3D'/scidirimg/btn_xclose_hov.gif';"=20
                  title=3DClose=20
                  =
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                  alt=3DClose=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/btn_xclose.gif"></A></DIV><=
IMG=20
                  title=3D"You are entitled to access the full text of =
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                  height=3D14=20
                  alt=3D"You are entitled to access the full text of =
this document"=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/sci_dir/jrn_sub.gif"=20
                  width=3D12 border=3D0>&nbsp;<B>Asymmetric Segregation =
of the Tumor=20
                  Suppressor Brat Regulates Self<WBR>-<WBR>Renewal in =
<SPAN=20
                  class=3Dit>Drosophila</SPAN> Neural Stem=20
                  Cells</B><BR><I>Cell</I>,&nbsp;<I>Volume 124, Issue=20
                  6</I>,&nbsp;<I>24 March 2006</I>, <I>Pages=20
                  1241-1253</I><BR>Joerg Betschinger, Karl Mechtler and =
Juergen=20
                  A. Knoblich<BR><BR><B>Abstract</B><BR>
                  <DIV class=3DmlktScroll>
                  <DIV style=3D"LINE-HEIGHT: 150%">
                  <DIV class=3Dh3>Summary</DIV>How stem cells generate =
both=20
                  differentiating and self-renewing daughter cells is =
unclear.=20
                  Here, we show that <SPAN class=3Dit>Drosophila</SPAN> =
larval=20
                  neuroblasts=E2=80=94stem cell-like precursors of the =
adult=20
                  brain=E2=80=94regulate proliferation by segregating =
the growth=20
                  inhibitor Brat and the transcription factor Prospero =
into only=20
                  one daughter cell. Like Prospero, Brat binds and =
cosegregates=20
                  with the adaptor protein Miranda. In larval =
neuroblasts, both=20
                  Brat and Prospero are required to inhibit self-renewal =
in one=20
                  of the two daughter cells. While Prospero regulates =
cell-cycle=20
                  gene transcription, Brat acts as a posttranscriptional =

                  inhibitor of dMyc. In <SPAN class=3Dit>brat</SPAN> or =
<SPAN=20
                  class=3Dit>prospero</SPAN> mutants, both daughter =
cells grow and=20
                  behave like neuroblasts leading to the formation of =
larval=20
                  brain tumors. Similar defects are seen in <SPAN=20
                  class=3Dit>lethal giant larvae (lgl)</SPAN> mutants =
where Brat=20
                  and Prospero are not asymmetric. We have identified a=20
                  molecular mechanism that may control self-renewal and =
prevent=20
                  tumor formation in other stem cells as =
well.</DIV></DIV><BR><A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSN-4JJ85XW-M&amp;_user=3D10&amp;_coverDate=3D03%2F24%2F2006&amp;_rdoc=3D=
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ersion=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D098044e5ef22c38=
d79b3cf9aad3e890d">SummaryPlus</A>=20
                  | <A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSN-4JJ85XW-M&amp;_user=3D10&amp;_coverDate=3D03%2F24%2F2006&amp;_rdoc=3D=
1&amp;_fmt=3Dfull&amp;_orig=3Darticle&amp;_cdi=3D7051&amp;_sort=3Dv&amp;_=
docanchor=3D&amp;view=3Dc&amp;_ct=3D1163&amp;_acct=3DC000050221&amp;_vers=
ion=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3Df007670e5538a176ad=
2389756b560611">Full=20
                  Text + Links</A> | <A=20
                  onclick=3D"var =
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newHeight=3Ddocument.body.clientHeight; var pdfWin; =
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eight+',resizable=3Dyes, left=3D50, top=3D50');pdfWin.focus()"=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DMImg&amp;_imagekey=3DB=
6WSN-4JJ85XW-M-2&amp;_cdi=3D7051&amp;_user=3D10&amp;_orig=3Darticle&amp;_=
coverDate=3D03%2F24%2F2006&amp;_sk=3D998759993&amp;view=3Dc&amp;wchp=3DdG=
LzVlz-zSkzV&amp;md5=3D0b539bda864bd211a3eb27f737bfdae6&amp;ie=3D/sdarticl=
e.pdf"=20
                  target=3DnewPdfWin>PDF (1340 K)</A>=20
            </TD></TR></TBODY></TABLE></DIV></DIV>
            <DIV class=3Dinfobubble-container>
            <DIV class=3DmlktLink id=3DmlktLink_3>
            <TABLE cellSpacing=3D0 cellPadding=3D0 border=3D0>
              <TBODY>
              <TR>
                <TD=20
                style=3D"PADDING-RIGHT: 5px; PADDING-LEFT: 5px; =
PADDING-BOTTOM: 0px; PADDING-TOP: 5px"=20
                vAlign=3Dtop><IMG title=3D"" alt=3D""=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/bullet_square.gif"></TD>
                <TD><A=20
                  =
onmouseover=3D"InfoBubble.show('infobubble_3','mlktLink_3')"=20
                  onmouseout=3DInfoBubble.timeout()=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WW3-4H7T3KK-3&amp;_user=3D10&amp;_origUdi=3DB6WSS-4KBDYF1-6&amp;_fmt=3D=
high&amp;_coverDate=3D10%2F31%2F2005&amp;_rdoc=3D1&amp;_orig=3Darticle&am=
p;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D1=
0&amp;md5=3D714950fb7425ba44fc0e1ba0075e1d2e">Asymmetric=20
                  Cell Division in Skin Development: A New=20
                  Loo...<BR><I>Developmental Cell</I></A><BR></TD></TR>
              <DIV></DIV></TBODY></TABLE>
            <DIV class=3Dinfobubble id=3Dinfobubble_3=20
            onmouseover=3D"InfoBubble.show('infobubble_3','mlktLink_3')" =

            onmouseout=3DInfoBubble.timeout()>
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              <TR>
                <TD>
                  <DIV style=3D"PADDING-LEFT: 5px; FLOAT: right"><A=20
                  onclick=3DInfoBubble.hide()><IMG=20
                  =
onmouseover=3D"javascript:this.src=3D'/scidirimg/btn_xclose_hov.gif';"=20
                  title=3DClose=20
                  =
onmouseout=3D"javascript:this.src=3D'/scidirimg/btn_xclose.gif';"=20
                  alt=3DClose=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/btn_xclose.gif"></A></DIV><=
IMG=20
                  title=3D"You are entitled to access the full text of =
this document"=20
                  height=3D14=20
                  alt=3D"You are entitled to access the full text of =
this document"=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/sci_dir/jrn_sub.gif"=20
                  width=3D12 border=3D0>&nbsp;<B>Asymmetric Cell =
Division in Skin=20
                  Development: A New Look at an Old=20
                  Observation</B><BR><I>Developmental =
Cell</I>,&nbsp;<I>Volume=20
                  9, Issue 4</I>,&nbsp;<I>October 2005</I>, <I>Pages=20
                  444-446</I><BR>Maranke I. Koster and Dennis R.=20
                  Roop<BR><BR><B>Abstract</B><BR>
                  <DIV class=3DmlktScroll>
                  <DIV style=3D"LINE-HEIGHT: 150%">During skin =
development, the=20
                  single-layered surface ectoderm covering the mouse =
embryo must=20
                  initiate stratification and terminal differentiation =
to=20
                  develop a functional epidermis. A recent article by =
Lechler=20
                  and Fuchs in <SPAN class=3Dit>Nature</SPAN> (Lechler =
and Fuchs,=20
                  2005) suggests that these events are triggered by =
asymmetric=20
                  cell division.</DIV></DIV><BR><A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
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ersion=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D38c0d72bd2f7c88=
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            </TD></TR></TBODY></TABLE></DIV></DIV>
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              <TBODY>
              <TR>
                <TD=20
                style=3D"PADDING-RIGHT: 5px; PADDING-LEFT: 5px; =
PADDING-BOTTOM: 0px; PADDING-TOP: 5px"=20
                vAlign=3Dtop><IMG title=3D"" alt=3D""=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/bullet_square.gif"></TD>
                <TD><A=20
                  =
onmouseover=3D"InfoBubble.show('infobubble_4','mlktLink_4')"=20
                  onmouseout=3DInfoBubble.timeout()=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B7GX3-4PVY325-4&amp;_user=3D10&amp;_origUdi=3DB6WSS-4KBDYF1-6&amp;_fmt=3D=
high&amp;_coverDate=3D01%2F07%2F2008&amp;_rdoc=3D1&amp;_orig=3Darticle&am=
p;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D1=
0&amp;md5=3D17a29fbfd967fcd75dea5a9501f13ce8">Asymmetric=20
                  Cell Division as a Route to Reduction in=20
                  Cel...<BR><I>Protist</I></A><BR></TD></TR>
              <DIV></DIV></TBODY></TABLE>
            <DIV class=3Dinfobubble id=3Dinfobubble_4=20
            onmouseover=3D"InfoBubble.show('infobubble_4','mlktLink_4')" =

            onmouseout=3DInfoBubble.timeout()>
            <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%">
              <TBODY>
              <TR>
                <TD>
                  <DIV style=3D"PADDING-LEFT: 5px; FLOAT: right"><A=20
                  onclick=3DInfoBubble.hide()><IMG=20
                  =
onmouseover=3D"javascript:this.src=3D'/scidirimg/btn_xclose_hov.gif';"=20
                  title=3DClose=20
                  =
onmouseout=3D"javascript:this.src=3D'/scidirimg/btn_xclose.gif';"=20
                  alt=3DClose=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/btn_xclose.gif"></A></DIV><=
IMG=20
                  title=3D"You are not entitled to access the full text =
of this document"=20
                  height=3D14=20
                  alt=3D"You are not entitled to access the full text of =
this document"=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/jrn_nsub.gif"=20
                  width=3D12 border=3D0>&nbsp;<B>Asymmetric Cell =
Division as a Route=20
                  to Reduction in Cell Length and Change in Cell =
Morphology in=20
                  Trypanosomes</B><BR><I>Protist</I>,&nbsp;<I>Volume =
159, Issue=20
                  1</I>,&nbsp;<I>7 January 2008</I>, <I>Pages=20
                  137-151</I><BR>Reuben Sharma, Lori Peacock, Eva =
Gluenz, Keith=20
                  Gull, Wendy Gibson and Mark=20
                  Carrington<BR><BR><B>Abstract</B><BR>
                  <DIV class=3DmlktScroll>
                  <DIV style=3D"LINE-HEIGHT: 150%">African trypanosomes =
go through=20
                  at least five developmental stages during their life =
cycle.=20
                  The different cellular forms are classified using =
morphology,=20
                  including the order of the nucleus, flagellum and =
kinetoplast=20
                  along the anterior=E2=80=93posterior axis of the cell, =
the predominant=20
                  cell surface molecules and the location within the =
host. Here,=20
                  an asymmetrical cell division cycle that is an =
integral part=20
                  of the <SPAN class=3Dit>Trypanosoma brucei</SPAN> life =
cycle has=20
                  been characterised in further detail through the use =
of cell=20
                  cycle stage specific markers. The cell cycle leading =
to the=20
                  asymmetric division includes an exquisitely =
synchronised=20
                  mitosis and exchange in relative location of =
organelles along=20
                  the anterior=E2=80=93posterior axis of the cell. These =
events are=20
                  coupled to a change in cell surface architecture. =
During the=20
                  asymmetric division, the behaviour of the new =
flagellum is=20
                  consistent with a role in determining the location of =
the=20
                  plane of cell division, a function previously =
characterised in=20
                  procyclic cells. Thus, the asymmetric cell division =
cycle=20
                  provides a mechanism for a change in cell morphology =
and also=20
                  an explanation for how a reduction in cell length can =
occur in=20
                  a cell shaped by a stable microtubule =
array.</DIV></DIV><BR><A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B7GX3-4PVY325-4&amp;_user=3D10&amp;_coverDate=3D01%2F07%2F2008&amp;_rdoc=3D=
1&amp;_fmt=3Dsummary&amp;_orig=3Darticle&amp;_cdi=3D20475&amp;_sort=3Dv&a=
mp;_docanchor=3D&amp;view=3Dc&amp;_ct=3D1163&amp;_acct=3DC000050221&amp;_=
version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3Dd7f72ca34f919e=
345dc4a78d85c14fe7">Abstract</A>=20
                  | <A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B7GX3-4PVY325-4&amp;_user=3D10&amp;_coverDate=3D01%2F07%2F2008&amp;_rdoc=3D=
1&amp;_fmt=3Dfull&amp;_orig=3Darticle&amp;_cdi=3D20475&amp;_sort=3Dv&amp;=
_docanchor=3D&amp;view=3Dc&amp;_ct=3D1163&amp;_acct=3DC000050221&amp;_ver=
sion=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3Dec4f7172cca9e262e=
74beffa87cf8191">Full=20
                  Text + Links</A> | <A=20
                  =
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7GX3-4PVY325-4-P&amp;_cdi=3D20475&amp;_user=3D10&amp;_orig=3Darticle&amp;=
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GLzVlz-zSkzV&amp;md5=3D820259d8eeac3520fbff8ab111fc6be3&amp;ie=3D/sdartic=
le.pdf">PDF=20
                  (1222 K)</A> </TD></TR></TBODY></TABLE></DIV></DIV>
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            <DIV class=3DmlktLink id=3DmlktLink_5>
            <TABLE cellSpacing=3D0 cellPadding=3D0 border=3D0>
              <TBODY>
              <TR>
                <TD=20
                style=3D"PADDING-RIGHT: 5px; PADDING-LEFT: 5px; =
PADDING-BOTTOM: 0px; PADDING-TOP: 5px"=20
                vAlign=3Dtop><IMG title=3D"" alt=3D""=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/bullet_square.gif"></TD>
                <TD><A=20
                  =
onmouseover=3D"InfoBubble.show('infobubble_5','mlktLink_5')"=20
                  onmouseout=3DInfoBubble.timeout()=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6VRW-466NN03-G&amp;_user=3D10&amp;_origUdi=3DB6WSS-4KBDYF1-6&amp;_fmt=3D=
high&amp;_coverDate=3D12%2F31%2F1997&amp;_rdoc=3D1&amp;_orig=3Darticle&am=
p;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D1=
0&amp;md5=3Da5b2055e3f4cf3e4593e9c8c274b5565">Asymmetric=20
                  cell division and cell fate in plants<BR><I>Current =
Opinion in=20
                  Cell Biology</I></A><BR></TD></TR>
              <DIV></DIV></TBODY></TABLE>
            <DIV class=3Dinfobubble id=3Dinfobubble_5=20
            onmouseover=3D"InfoBubble.show('infobubble_5','mlktLink_5')" =

            onmouseout=3DInfoBubble.timeout()>
            <TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%">
              <TBODY>
              <TR>
                <TD>
                  <DIV style=3D"PADDING-LEFT: 5px; FLOAT: right"><A=20
                  onclick=3DInfoBubble.hide()><IMG=20
                  =
onmouseover=3D"javascript:this.src=3D'/scidirimg/btn_xclose_hov.gif';"=20
                  title=3DClose=20
                  =
onmouseout=3D"javascript:this.src=3D'/scidirimg/btn_xclose.gif';"=20
                  alt=3DClose=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/btn_xclose.gif"></A></DIV><=
IMG=20
                  title=3D"You are not entitled to access the full text =
of this document"=20
                  height=3D14=20
                  alt=3D"You are not entitled to access the full text of =
this document"=20
                  =
src=3D"http://www.sciencedirect.com/scidirimg/jrn_nsub.gif"=20
                  width=3D12 border=3D0>&nbsp;<B>Asymmetric cell =
division and cell=20
                  fate in plants</B><BR><I>Current Opinion in Cell=20
                  Biology</I>,&nbsp;<I>Volume 9, Issue =
6</I>,&nbsp;<I>December=20
                  1997</I>, <I>Pages 842-848</I><BR>Kimberly Gallagher =
and=20
                  Laurie G Smith<BR><BR><B>Abstract</B><BR>
                  <DIV class=3DmlktScroll>
                  <DIV style=3D"LINE-HEIGHT: 150%">A variety of =
approaches has=20
                  recently been employed to investigate how sister cells =
adopt=20
                  distinct fates following asymmetric divisions during =
plant=20
                  development. Surgical and drug studies have been used =
to=20
                  analyze asymmetric divisions during both early =
embryogenesis=20
                  in brown algae and pollen development in tobacco. =
Genetic=20
                  screens have been used to identify genes in <SPAN=20
                  class=3Dit>Arabidopsis thaliana</SPAN> that are =
required for=20
                  specific asymmetric cell divisions during pollen and =
root=20
                  development. These studies indicate that cell polarity =
and=20
                  division orientation are closely tied to the process =
of cell=20
                  fate specification, and suggest that differential =
inheritance=20
                  of determinants and positional information may both be =

                  involved in the specification of cell fates following=20
                  asymmetric cell division.</DIV></DIV><BR><A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6VRW-466NN03-G&amp;_user=3D10&amp;_coverDate=3D12%2F31%2F1997&amp;_rdoc=3D=
1&amp;_fmt=3Dsummary&amp;_orig=3Darticle&amp;_cdi=3D6245&amp;_sort=3Dv&am=
p;_docanchor=3D&amp;view=3Dc&amp;_ct=3D1163&amp;_acct=3DC000050221&amp;_v=
ersion=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D4a8c1b0d247248b=
c9d0e5fcb33b68d34">Abstract</A>=20
                  | <A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6VRW-466NN03-G&amp;_user=3D10&amp;_coverDate=3D12%2F31%2F1997&amp;_rdoc=3D=
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ion=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D4598c13bb1e55a7f52=
771bf6cf5a0a77">Abstract=20
                  + References</A> | <A=20
                  =
href=3D"http://www.sciencedirect.com/science?_ob=3DMImg&amp;_imagekey=3DB=
6VRW-466NN03-G-1&amp;_cdi=3D6245&amp;_user=3D10&amp;_orig=3Darticle&amp;_=
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                  (672 K)</A>=20
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target=3Ddoilink>doi:10.1016/j.neuron.2006.06.016</A>&nbsp;&nbsp;&nbsp;&n=
bsp;<A=20
onmouseover=3D"window.status=3D'Help is Available';return true"=20
onclick=3D"var helpWin; =
helpWin=3Dwindow.open('/science?_ob=3DHelpURL&amp;_file=3Ddoi.htm&amp;_ac=
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<P>
<H4 class=3Dh4>
<P>Minireview </H4>
<DIV class=3DarticleTitle>
<P><I>Drosophila</I> Neuroblast Asymmetric Cell Division: Recent =
Advances and=20
Implications for Stem Cell Biology </P></DIV><STRONG>
<P>Fengwei Yu<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#aff1"><SUP>1</SUP></A><SUP>,=20
</SUP><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#aff2"><SUP>2</SUP></A>,=20
Chay T. Kuo<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#aff1"><SUP>1</SUP></A>=20
and Yuh Nung Jan<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#aff1"><SUP>1</SUP></A><SUP>,=20
</SUP><A name=3Dbcor1></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#cor1"><SUP><IMG=20
alt=3D"Corresponding Author Contact Information"=20
src=3D"http://www.sciencedirect.com/scidirimg/entities/REcor.gif"=20
border=3D0></SUP></A><SUP>, </SUP><A =
href=3D"mailto:yuhnung.jan@ucsf.edu"><SUP><IMG=20
alt=3D"E-mail The Corresponding Author"=20
src=3D"http://www.sciencedirect.com/scidirimg/entities/REemail.gif"=20
border=3D0></SUP></A> </STRONG><BR><A name=3Daff1></A><SUP>1</SUP>Howard =
Hughes=20
Medical Institute and Departments of Physiology, Biochemistry, and =
Biophysics,=20
University of California, Rock Hall, 1550 Fourth Street, San Francisco,=20
California 94143<BR><A name=3Daff2></A><SUP>2</SUP>Temasek Life Sciences =

Laboratory and Department of Biological Sciences, National University of =

Singapore, 1 Research Link, 117604, Singapore <BR><BR>Available online 5 =
July=20
2006. <BR><BR></P>
<DIV class=3DartAbs>
<P>Asymmetric cell division is an evolutionarily conserved mechanism =
widely used=20
to generate cellular diversity during development. <I>Drosophila</I> =
neuroblasts=20
have been a useful model system for studying the molecular mechanisms of =

asymmetric cell division. In this minireview, we focus on recent =
progress in=20
understanding the role of heterotrimeric G proteins and their regulators =
in=20
asymmetric spindle geometry, as well as the role of an =
Inscuteable-independent=20
microtubule pathway in asymmetric localization of proteins in =
neuroblasts. We=20
also discuss issues of progenitor proliferation and differentiation =
associated=20
with asymmetric cell division and their broader implications for stem =
cell=20
biology. </P></DIV><BR clear=3Dall>
<DIV class=3Dart>
<H3 class=3Dh3>Article Outline</H3>
<DL>
  <DT><A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#sec1">Main=20
  Text</A>
  <DL>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#sec1.1">Receptor-Independent=20
    Activation of Heterotrimeric G Proteins in Drosophila NBs</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#sec1.2">Heterotrimeric=20
    G Proteins and Asymmetric Spindle Geometry</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#sec1.3">Asymmetric=20
    Protein Localization and Mitotic Spindle Orientation</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#sec1.4">Asymmetric=20
    Cell Division Coordinates Proliferation and Differentiation</A>
    <DT><A=20
    =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#sec1.5">Implications=20
    for Mammalian Stem Cell Biology</A></DT></DL>
  <DT><A=20
  =
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bibl001">References</A></DT></DL></DIV><BR>
<DIV class=3Dart><A name=3Dsec1></A>
<H3 class=3Dh3>Main Text</H3>
<P>Asymmetric cell division is one of the primary mechanisms used by =
progenitor=20
cells to generate neuronal diversity in <I>Drosophila</I> central and =
peripheral=20
nervous systems (CNS and PNS, respectively). The study of its underlying =

mechanisms started about 12 years ago with the discovery that Numb =
functions as=20
an intrinsic cell-fate determinant that is segregated into only one of =
the two=20
daughter cells during neural precursor division (<A name=3Dbbib35></A><A =

href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib35">Rhyu=20
et al., 1994</A>). Since then, largely through the efforts of a handful =
of labs,=20
considerable insights into the inner workings of this fundamental =
pathway have=20
been gained. In this minireview, we will discuss recent progress in this =
field.=20
Before doing so, we will first start with a brief overview of the =
=E2=80=9Cstate of the=20
field=E2=80=9D until just a couple of years ago.
<P>In the <I>Drosophila</I> embryonic CNS, each abdominal segment of the =
ventral=20
nerve cord (VNC) consists of approximately 700 neurons and 60 glial =
cells that=20
have distinct fates and morphologies. These neurons and glia are =
together=20
derived from roughly 60 progenitor cells called neuroblasts (NBs). To =
generate=20
the diversity of cell fates from a single precursor cell, NBs undergo =
programmed=20
asymmetric cell division. During <I>Drosophila</I> embryogenesis, NBs =
are=20
specified from a monolayer of epithelial cells called the neuroectoderm =
through=20
a process of lateral inhibition. Once specified, NBs delaminate from the =

epithelium layer and enter mitosis. During prophase of the cell cycle, =
two=20
centrosomes migrate laterally to opposite sites of the NB with parallel=20
alignment to the epithelium layer. At metaphase, the mitotic spindle =
rotates by=20
90=C2=B0 to be oriented along the apical-basal axis. Upon cytokinesis, =
each NB gives=20
rise to two daughter cells with distinct size and fate. The larger =
apical=20
daughter cell maintains a NB identity and continues to divide in a=20
stem-cell-like fashion, whereas the smaller basal daughter cell becomes =
a=20
ganglion mother cell (GMC) which undergoes terminal division to generate =
two=20
postmitotic neurons or glia (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#fig1">Figure=20
1</A>; also reviewed by <A name=3Dbbib6></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib6">Betschinger=20
and Knoblich, 2004</A>, <A name=3Dbbib14></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib14">Chia=20
and Yang, 2002</A> and <A name=3Dbbib24></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib24">Jan=20
and Jan, 2001</A>).=20
<BLOCKQUOTE>
  <P><A name=3Dfig1></A><A name=3D1></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KBDYF1-6&amp;_image=3Dfig1&amp;_ba=3D1&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D87b807fd5b35305d8d6b884529558e66'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KBDYF1-6&amp;_image=3Dfig1&amp;_ba=3D1=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D87b807fd5b35305d8d6b884529558e66"><IMG=20
        title=3D"Display Full Size version of this image (38K) - Opens =
new window"=20
        height=3D62 alt=3DImage hspace=3D2=20
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src=3D"http://www.sciencedirect.com/cache/MiamiImageURL/B6WSS-4KBDYF1-6-5=
/0?wchp=3DdGLzVlz-zSkzV"=20
        width=3D125 align=3Dmiddle vspace=3D2 border=3D1></A></TD>
      <TD vAlign=3Dbottom><A=20
        title=3D"Display Full Size version of this image (38K) - Opens =
new window"=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KBDYF1-6&amp;_image=3Dfig1&amp;_ba=3D1&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D87b807fd5b35305d8d6b884529558e66'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KBDYF1-6&amp;_image=3Dfig1&amp;_ba=3D1=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D87b807fd5b35305d8d6b884529558e66"=20
        alt=3D"Display Full Size version of this image (38K) - Opens new =
window">Display=20
        Full Size version of this image</A> =
(38K)</TD></TR></TBODY></TABLE>
  <P>Figure 1.&nbsp;Asymmetric Cell Division of <I>Drosophila</I> NB
  <P>A schematic representation of NB delaminating from epithelium. As =
the NB is=20
  delaminating from the epithelium, it forms an apical stalk, which is =
in=20
  contact with the surrounding epithelial cells. During prophase,=20
  Par/Insc/Pins/G=CE=B1i proteins (red crescent) are asymmetrically =
localized at the=20
  apical cortex, whereas Numb/Pon/Pros/Mira (yellow crescent) proteins =
are=20
  localized at the basal cortex. The two centrosomes and the mitotic =
spindle=20
  (green) are aligned parallel to the surface of epithelium. During =
metaphase,=20
  the mitotic spindle rotates 90=C2=B0 to become aligned perpendicular =
to the=20
  epithelial layer. During anaphase/telophase, asymmetric spindle =
geometry is=20
  generated, which divides the neuroblast into two daughter cells of =
distinct=20
  fate and size: a large apical NB and a smaller basal GMC. The basal =
daughter=20
  GMC preferentially inherits cell-fate determinants Numb and Pros.=20
  <P></P></BLOCKQUOTE>
<P>The apical-basal polarity of an epithelial cell is established =
through an=20
evolutionarily conserved protein complex consisting of Bazooka (Baz, the =
fly=20
homolog of <I>C. elegans</I> Par-3), Par-6, and atypical PKC (aPKC), =
also known=20
as the Par complex. This protein complex is maintained in the specified =
NB and=20
utilized by the NB to preserve its cellular polarity. When a NB =
delaminates from=20
the epithelium, it forms a cellular structure called the =E2=80=9Capical =
stalk,=E2=80=9D which=20
is in contact with the surrounding epithelial cells (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#fig1">Figure=20
1</A>). The Par complex in the apical stalk colocalizes with the =
NB-specific=20
protein Inscuteable (Insc), establishing an apical-basal polarity in the =

delaminating NB. During mitosis, the Insc/Par complex localizes to the =
apical=20
cortex as a crescent and recruits another evolutionarily conserved =
protein=20
complex, comprised of Partner of Inscuteable (Pins) and the =
heterotrimeric G=20
protein subunit G=CE=B1i, that maintains apical-basal polarity. This =
sequential=20
recruitment model explains how apical-basal polarity of a NB is first=20
established and subsequently maintained during the first round of =
asymmetric=20
cell division (<A name=3Dbbib33></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib33">Parmentier=20
et al., 2000</A>, <A name=3Dbbib38></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib38">Schaefer=20
et al., 2000</A> and <A name=3Dbbib54></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib54">Yu=20
et al., 2000</A>).
<P>The primary roles of the two protein complexes are distinct: the =
Pins/G=CE=B1i=20
complex is mainly involved in spindle orientation (metaphase NBs align =
their=20
spindles perpendicular to the epithelium layer), whereas the Par complex =
appears=20
to play a primary role in the basal localization of cell-fate =
determinants (<A=20
name=3Dbbib53></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib53">Wodarz=20
et al., 1999</A>, <A name=3Dbbib41></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib41">Schober=20
et al., 1999</A> and <A name=3Dbbib22></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib22">Izumi=20
et al., 2004</A>). The apical Par complex directs the basal localization =
and=20
segregation of cell-fate determinants, such as Prospero (Pros) and Numb =
and=20
their adaptor proteins, Miranda (Mira) and Partner of Numb (Pon) through =
two=20
cortically localized tumor suppressors, Discs large (Dlg) and Lethal (2) =
giant=20
larvae (Lgl) (<A name=3Dbbib58></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib58">Ohshiro=20
et al., 2000</A>, <A name=3Dbbib59></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib59">Peng=20
et al., 2000</A> and <A name=3Dbbib7></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib7">Betschinger=20
et al., 2003</A>). Dlg and Lgl are primarily involved in localizing =
basal=20
proteins and have only a mild effect on the crescent formation of the =
apical=20
proteins (<A name=3Dbbib58></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib58">Ohshiro=20
et al., 2000</A>, <A name=3Dbbib59></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib59">Peng=20
et al., 2000</A> and <A name=3Dbbib42></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib42">Siegrist=20
and Doe, 2005</A>), although Dlg can also interact with apical protein =
Pins (<A=20
name=3Dbbib4></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib4">Bellaiche,=20
et al., 2001</A>). Phosphorylation of Lgl by apically localized aPKC =
leads to=20
Lgl inactivation and prevents its association with the apical cortex, =
while=20
nonphosphorylated Lgl at the basal cortex is in an active state and =
recruits=20
cell-fate determinants (<A name=3Dbbib7></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib7">Betschinger=20
et al., 2003</A>). The phosphorylation state of Lgl also restricts =
myosin II=20
activity to the apical cortex, which results in the =
=E2=80=9Cpush=E2=80=9D of cell-fate=20
determinants to the basal cortex (<A name=3Dbbib3></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib3">Barros=20
et al., 2003</A>). In contrast to the function of Myosin II in excluding =

cell-fate determinants from the apical cortex, Myosin VI (also termed =
Jaguar)=20
positively regulates basal localization and segregation of Mira/Pros via =
vesicle=20
transport machinery (<A name=3Dbbib34></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib34">Petritsch=20
et al., 2003</A>).
<P>For the remainder of this minireview, we will focus on four aspects =
of NB=20
asymmetric cell division that have been highlighted by recent studies. =
We will=20
first discuss how heterotrimeric G proteins are activated in a=20
receptor-independent manner. Next, we will explore how asymmetric =
spindle=20
geometry is generated during anaphase/telophase and what factors orient =
mitotic=20
spindle along the apical-basal axis. And finally, we return to a =
fundamental=20
question of how proliferation and differentiation are coordinated during =

asymmetric cell division and the implications of these studies for =
mammalian=20
stem cell biology. A review of another area of considerable recent =
progress,=20
namely, the role of endocytic pathway in asymmetric cell division of=20
<I>Drosophila</I> sensory organ precursors (SOPs) can be found elsewhere =
(<A=20
name=3Dbbib45></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib45">Somers=20
and Chia, 2005</A>).<A name=3Dsec1.1></A>
<H4 class=3Dh4>Receptor-Independent Activation of Heterotrimeric G =
Proteins in=20
Drosophila NBs</H4>
<P>In the canonical model of heterotrimeric G protein signaling, =
extracellular=20
signals can be transduced to targets within the cell through a =
seven-pass=20
transmembrane receptor called G protein coupled receptor (GPCR). In the =
inactive=20
state, the GDP-G=CE=B1G=CE=B2=CE=B3 heterotrimer associates with GPCR. =
Upon ligand binding,=20
GPCR acts as a guanine nucleotide exchange factor (GEF) to stimulate =
release of=20
GDP from the G=CE=B1 subunit, which in turn is converted to the GTP =
bound form.=20
GTP-G=CE=B1 dissociates from the G=CE=B2=CE=B3 complex and each =
activates its downstream=20
effectors. G protein signaling is attenuated through the hydrolysis of =
GTP to=20
GDP by the intrinsic GTPase activity of G=CE=B1. The hydrolysis rate is =
accelerated=20
by GTPase-activating proteins (GAPs), which typically contain regulator =
of G=20
protein signaling (RGS) domain(s) (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#fig2">Figure=20
2</A>A).=20
<BLOCKQUOTE>
  <P><A name=3Dfig2></A><A name=3D2></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KBDYF1-6&amp;_image=3Dfig2&amp;_ba=3D2&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3Dfa8099ec95e2188f59bb555d6f320c4b'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KBDYF1-6&amp;_image=3Dfig2&amp;_ba=3D2=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3Dfa8099ec95e2188f59bb555d6f320c4b"><IMG=20
        title=3D"Display Full Size version of this image (33K) - Opens =
new window"=20
        height=3D93 alt=3DImage hspace=3D2=20
        =
src=3D"http://www.sciencedirect.com/cache/MiamiImageURL/B6WSS-4KBDYF1-6-9=
/0?wchp=3DdGLzVlz-zSkzV"=20
        width=3D96 align=3Dmiddle vspace=3D2 border=3D1></A></TD>
      <TD vAlign=3Dbottom><A=20
        title=3D"Display Full Size version of this image (33K) - Opens =
new window"=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KBDYF1-6&amp;_image=3Dfig2&amp;_ba=3D2&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3Dfa8099ec95e2188f59bb555d6f320c4b'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KBDYF1-6&amp;_image=3Dfig2&amp;_ba=3D2=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3Dfa8099ec95e2188f59bb555d6f320c4b"=20
        alt=3D"Display Full Size version of this image (33K) - Opens new =
window">Display=20
        Full Size version of this image</A> =
(33K)</TD></TR></TBODY></TABLE>
  <P>Figure 2.&nbsp;Canonical and Noncanonical Models of Heterotrimeric =
G=20
  Protein Signaling
  <P>(A) In the canonical model, upon ligand binding, a seven-pass =
transmembrane=20
  protein, GPCR, can act as a GEF to activate heterotrimeric G proteins. =
In the=20
  <I>Drosophila</I> NBs, heterotrimeric G proteins can also be activated =
in a=20
  receptor-independent manner.
  <P>(B) In a possible noncanonical cycle, two GDIs, Pins, Loco, and a =
putative=20
  cytosolic GEF, Ric-8, may act synergistically to activate =
heterotrimeric G=20
  proteins. The attenuation of G proteins may be mediated by Loco acting =
as a=20
  GAP.=20
  <P></P></BLOCKQUOTE>
<P>Heterotrimeric G proteins can also be activated through a=20
receptor-independent mechanism by cytosolic proteins containing =
GoLoco/GPR=20
domains, a mechanism employed in <I>Drosophila</I> NB asymmetric cell =
division.=20
GoLoco/GPR domain proteins can interact with GDP-G=CE=B1 and compete =
with G=CE=B2=CE=B3 for=20
GDP-G=CE=B1 binding. In this capacity, GoLoco/GPR domain proteins act as =
guanine=20
nucleotide dissociation inhibitors (GDIs) to dissociate GDP-G=CE=B1 from =
G=CE=B2=CE=B3 dimer.=20
In the absence of ligand binding to GPCR, this mechanism may initiate =
the=20
noncanonical heterotrimeric G protein signaling pathway. In =
<I>Drosophila</I>,=20
the GoLoco/GPR domain-containing proteins Pins and Loco act as GDIs for =
G=CE=B1i (<A=20
name=3Dbbib39></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib39">Schaefer=20
et al., 2001</A> and <A name=3Dbbib56></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib56">Yu=20
et al., 2005</A>). <I>pins</I>, <I>loco</I>, or <I>G</I>=CE=B1<I>i</I> =
single mutants=20
display similar phenotypes in spindle geometry and daughter cell size=20
difference. Simultaneous inactivation of Pins and Loco results in a much =
more=20
severe disruption of spindle geometry and daughter cell size difference, =
similar=20
to <I>G</I>=CE=B2 <I>13F</I> or <I>G</I>=CE=B3<I>1</I> mutants which =
remove =CE=B2 and =CE=B3=20
subunits of heterotrimeric G proteins respectively, suggesting that Pins =
and=20
Loco may act redundantly to dissociate the inactive heterotrimer in=20
<I>Drosophila</I> NBs (<A name=3Dbbib56></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib56">Yu=20
et al., 2005</A>; <A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#fig2">Figure=20
2</A>B). Loco also contains the RGS domain that shows GAP activity for =
G=CE=B1i,=20
indicating that Loco may act as a GAP to hydrolyze GTP-G=CE=B1i to =
GDP-G=CE=B1i (<A=20
name=3Dbbib56></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib56">Yu=20
et al., 2005</A>; <A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#fig2">Figure=20
2</A>B).
<P>A question remains as to how GDP-G=CE=B1i is converted to =
GTP-G=CE=B1i in the absence=20
of GPCRs acting as receptor GEFs. One candidate molecule that performs =
this=20
function could be the evolutionally conserved Ric-8. Mammalian Ric-8A =
can act as=20
a cytosolic GEF for GoLoco bound myristoylated G=CE=B1i (<A =
name=3Dbbib48></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib48">Tall=20
and Gilman, 2005</A>). In nematodes, Ric-8 exhibits GEF activity for =
only one of=20
two redundant G=CE=B1 proteins implicated in the asymmetric cell =
division of one-cell=20
zygotes (<A name=3Dbbib1></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib1">Afshar=20
et al., 2004</A> and <A name=3Dbbib2></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib2">Afshar=20
et al., 2005</A>). In <I>Drosophila</I>, Ric-8 is required for the=20
membrane-targeting of heterotrimeric G proteins (<A name=3Dbbib15></A><A =

href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib15">David=20
et al., 2005</A>, <A name=3Dbbib21></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib21">Hampoelz=20
et al., 2005</A> and <A name=3Dbbib51></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib51">Wang=20
et al., 2005</A>). However, it remains to be determined whether=20
<I>Drosophila</I> Ric-8 possesses a GEF activity for G=CE=B1i. One =
plausible model=20
for receptor-independent cycling of heterotrimeric G proteins is =
illustrated in=20
<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#fig2">Figure=20
2</A>B.
<P>In the canonical mode, GTP-G=CE=B1i is generally considered the =
active protein=20
that activates various downstream effectors. It remains to be determined =
whether=20
the GDP bound or GTP bound G=CE=B1i is active in the =
receptor-independent model. In=20
<I>Drosophila,</I> embryos overexpressing GTP-G=CE=B1i exhibit mild =
defects, whereas=20
overexpression of GDP-G=CE=B1i produces much stronger defects (<A =
name=3Dbbib39></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib39">Schaefer=20
et al., 2001</A> and <A name=3Dbbib56></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib56">Yu=20
et al., 2005</A>), suggesting that GDP-G=CE=B1i, together with Pins and =
Loco, might=20
play important roles in <I>Drosophila</I> NBs. Furthermore, it would be=20
important to identify the downstream effectors of activated G=CE=B1i and =
G=CE=B2=CE=B3 during=20
NB asymmetric cell divisions.<A name=3Dsec1.2></A>
<H4 class=3Dh4>Heterotrimeric G Proteins and Asymmetric Spindle =
Geometry</H4>
<P>One important aspect of NB asymmetric cell divisions is the =
correlation=20
between asymmetric spindle geometry and daughter cell size. The mitotic =
NB forms=20
an apically-biased spindle during anaphase/telophase with the following=20
characteristics (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#fig1">Figure=20
1</A>): first, the apical centrosome is larger in size than the basal =
one;=20
second, astral microtubules emanating from the apical centrosome grow =
more=20
robustly; third, the apical centrosome is located far from the proximal =
cortex=20
whereas the basal centrosome is almost attached to the basal cortex (so =
called=20
=E2=80=9Cbasal displacement of mitotic spindle=E2=80=9D); fourth, the =
apical half of spindle=20
that extends from the apical centrosome to the cleavage plane is longer =
than the=20
basal one (<A name=3Dbbib9></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib9">Bonaccorsi=20
et al., 2000</A>, <A name=3Dbbib25></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib25">Kaltschmidt=20
et al., 2000</A> and <A name=3Dbbib19></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib19">Fuse=20
et al., 2003</A>). Asymmetric spindle geometry, in general, correlates =
well with=20
daughter cell size differences during NB asymmetric cell divisions (<A=20
name=3Dbbib12></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib12">Cai=20
et al., 2003</A>, <A name=3Dbbib19></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib19">Fuse=20
et al., 2003</A>, <A name=3Dbbib22></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib22">Izumi=20
et al., 2004</A> and <A name=3Dbbib55></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib55">Yu=20
et al., 2003</A>). It results in dramatic size disparity between the NB =
daughter=20
and GMC daughter: the diameter of a NB is three times larger than that =
of a GMC=20
(<A name=3Dbbib12></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib12">Cai=20
et al., 2003</A>, <A name=3Dbbib19></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib19">Fuse=20
et al., 2003</A> and <A name=3Dbbib22></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib22">Izumi=20
et al., 2004</A>). One exception to this correlation, however, is the=20
<I>asterless</I> (<I>asl</I>) mutant, whose NBs divide asymmetrically in =
the=20
absence of centrosomes and astral microtubules (<A name=3Dbbib9></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib9">Bonaccorsi=20
et al., 2000</A>). It remains possible that <I>asl</I> mutant NBs retain =
a=20
residual amount of functional astral microtubules and centrosomes.
<P>Both the spindle geometry and daughter cell size difference are =
controlled by=20
two redundant pathways mediated by the Insc/Baz/Par-6/aPKC proteins and =
the=20
Pins/G=CE=B1i/Loco proteins (<A name=3Dbbib12></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib12">Cai=20
et al., 2003</A>, <A name=3Dbbib55></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib55">Yu=20
et al., 2003</A> and <A name=3Dbbib56></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib56">Yu=20
et al., 2005</A>). The majority of mutant NBs that lose a single =
component of=20
either complex still divide asymmetrically to produce daughter cells of =
unequal=20
size. However, the spindle asymmetry and daughter cell size difference =
are=20
entirely disrupted when an additional component of the =
Insc/Baz/Par-6/aPKC=20
complex is removed in <I>pins</I>, <I>loco</I>, or <I>G=CE=B1i</I> =
mutants. In=20
<I>G</I>=CE=B2<I>13F</I> or <I>G</I>=CE=B3<I>1</I> mutant, the majority =
of NBs exhibit=20
symmetric spindle structure and divide into two equally sized daughter =
cells (<A=20
name=3Dbbib19></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib19">Fuse=20
et al., 2003</A> and <A name=3Dbbib22></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib22">Izumi=20
et al., 2004</A>), suggesting that cortically localized G=CE=B2=CE=B3 =
proteins play a more=20
prominent role than other apical proteins in this process.
<P>There are currently several models for how cortically localized =
G=CE=B213F can=20
affects daughter cell size asymmetry. The first model proposes that =
active G=CE=B213F=20
functions to suppress the length of basal spindle arm while its activity =
at the=20
apical side is antagonized by G=CE=B1i, resulting in the formation of an =
asymmetric=20
spindle (<A name=3Dbbib19></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib19">Fuse=20
et al., 2003</A>). This is supported by the fact that =
<I>G</I>=CE=B2<I>13F</I> mutant=20
NBs form a large symmetric spindle whereas the elevated activity of=20
<I>G</I>=CE=B2<I>13F</I> results in a small symmetric spindle. The =
second model uses=20
the data that Insc/aPKC and Pins/G=CE=B1i are delocalized in =
<I>G</I>=CE=B2<I>13F</I>=20
mutant NBs, which suggests that <I>G</I>=CE=B2<I>13F</I> may control =
both the=20
Insc/Par and Pins/G=CE=B1i pathways to regulate spindle geometry (<A=20
name=3Dbbib55></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib55">Yu=20
et al., 2003</A>). The third model suggests that =
<I>G</I>=CE=B2<I>13F</I> regulates=20
spindle geometry by restricting G=CE=B1i localization to the apical side =
(<A=20
name=3Dbbib51></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib51">Wang=20
et al., 2005</A>), which are supported by the following: first, in=20
<I>G</I>=CE=B2<I>13F</I> mutant embryos, G=CE=B1i is localized uniformly =
around the NB=20
cortex, raising a possibility that cortically localized G=CE=B1i may be =
active to=20
regulate spindle geometry from both apical and basal sides; second, a=20
<I>G</I>=CE=B2<I>13F ric-8</I> double mutant, in which G=CE=B1i and Pins =
are cytosolic,=20
resembles a <I>ric-8</I> or <I>G</I>=CE=B1<I>i</I> single mutant but not =

<I>G</I>=CE=B2<I>13F</I> mutant in terms of daughter cell size =
differences.
<P>Thus, G=CE=B1i may be a key regulator in controlling spindle geometry =
and daughter=20
cell size difference, such that the high frequency of symmetric division =
in=20
<I>G</I>=CE=B2<I>13F</I> or <I>G</I>=CE=B3<I>1</I> mutants is the =
indirect consequence of=20
the cortical localization of G=CE=B1i/Pins, which may override polarity =
cues from Par=20
proteins (<A name=3Dbbib51></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib51">Wang=20
et al., 2005</A>). It was also reported that a different <I>ric-8</I> =
mutant=20
allele exhibits equal size division in the majority of NBs, similar to =
that seen=20
in <I>G</I>=CE=B2<I>13F</I> mutants. This evidence supports the view =
that=20
Ric-8-mediated G=CE=B213F localization to the cortex may be a key =
pathway in=20
controlling spindle geometry and daughter cell size difference (<A=20
name=3Dbbib21></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib21">Hampoelz=20
et al., 2005</A>). In the future, the roles of G=CE=B1i and G=CE=B213F =
in spindle geometry=20
and daughter cell size difference could be further assessed if double =
germline=20
clone mutants of <I>G</I>=CE=B2<I>13F G</I>=CE=B1<I>i</I> can be =
generated and compared to=20
either <I>G</I>=CE=B2<I>13F</I> or <I>G</I>=CE=B1<I>i</I> single =
mutants.
<P>In mammalian cells, the G=CE=B1 subunit can bind microtubules (<A=20
name=3Dbbib60></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib60">Willard=20
et al., 2004</A>). However, it is not known whether heterotrimeric G =
proteins=20
can directly regulate spindle geometry by binding microtubules in=20
<I>Drosophila</I>. Evidence from the <I>ric-8</I> mutant, in which =
cytosolic G=CE=B1i=20
fails to associate with the mitotic spindle, suggests at least that =
GDP-G=CE=B1i (and=20
Pins) are unlikely to possess an affinity for microtubules in =
<I>Drosophila</I>.=20
Thus, one important remaining question is what mechanisms control the=20
reorganization of microtubules that coordinates the formation of the =
cleavage=20
furrow to generate daughter cell size differences during NB asymmetric =
cell=20
division.<A name=3Dsec1.3></A>
<H4 class=3Dh4>Asymmetric Protein Localization and Mitotic Spindle=20
Orientation</H4>
<P>The sequential recruitment model described earlier in this minireview =

explains how apical-basal polarity is initially established and =
subsequently=20
maintained in order for NBs to orient their mitotic spindle along the=20
apical-basal axis during the first round of asymmetric cell division. =
However,=20
it is not clear how the NB can =E2=80=9Cmemorize=E2=80=9D this =
apical-basal polarity to always=20
divide perpendicular to the epithelial surface. During in vitro culture=20
conditions, NBs maintain an intrinsic polarity and divide into two =
unequal-sized=20
daughter cells in the absence of neighboring cell contacts (<A=20
name=3Dbbib43></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib43">Siegrist=20
and Doe, 2006</A>). However, in these isolated NB cultures, NBs =
randomize the=20
spindle axis orientation over a series of divisions, leading to the =
generation=20
of daughter GMCs from random cortical positions. In contrast, in a =
culture of=20
clustered cells, NBs that retain contact with epithelial cells orient =
their=20
mitotic spindle perpendicular to the epithelial surface and consequently =
bud off=20
GMC daughters at the same site away from epithelial cells. This suggests =
that=20
cortical polarity and/or spindle orientation in NBs is regulated by =
either=20
extrinsic signals emanating from epithelial cells or by cell-cell =
contact=20
between the NB and neighboring epithelial cells (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#fig1">Figure=20
1</A>; <A name=3Dbbib43></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib43">Siegrist=20
and Doe, 2006</A>).
<P>Support for this idea comes from the <I>Drosophila</I> sensory organ=20
precursors (SOPs), located in the developing PNS. SOPs divide =
asymmetrically=20
along the anterior-posterior axis within the plane of the epithelium, =
and the=20
orientation of their division depends on receptors such as Frizzled and =
Flamingo=20
(<A name=3Dbbib20></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib20">Gho=20
and Schweisguth, 1998</A> and <A name=3Dbbib30></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib30">Lu=20
et al., 1999</A>). Although NBs divide under the epithelium plane unlike =
SOPs,=20
it is still possible that some unidentified receptor(s) could be =
clustered at=20
the site of contact between NBs and epithelial cells and thereby =
recruits the=20
apical complex. Interestingly, the intercellular region of Echinoid, a=20
transmembrane cell adhesion molecule, interacts with the PDZ domains of =
Baz to=20
regulate cell adhesion in the wing disc epithelial cells (<A =
name=3Dbbib52></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib52">Wei=20
et al., 2005</A>), raising the possibility that this or some other =
similar=20
interactions may be responsible for providing polarity cues to NBs.
<P>One hallmark of asymmetric cell division in <I>Drosophila</I> is the =
coupling=20
of asymmetrically localized proteins to each centrosome, leading to =
mitotic=20
spindle alignment and subsequent asymmetric protein segregation. Given =
that=20
apically localized proteins are required to orient the mitotic spindle =
during=20
mitosis, one may expect that adaptor proteins that can interact =
simultaneously=20
with apical cortical proteins, and microtubules could serve to align the =
spindle=20
along the apical-basal axis. In <I>C. elegans</I>, Lin-5, a=20
microtubule-associated protein, can interact with GPR-1/2, the nematode=20
counterpart of <I>Drosophila</I> Pins, to displace the mitotic spindle =
toward=20
the posterior cortex in the one-cell zygote (<A name=3Dbbib47></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib47">Srinivasan=20
et al., 2003</A>). In mammals, the microtubule binding protein, NuMA can =

interact with LGN, the mammalian homolog of <I>Drosophila</I> Pins, to =
control=20
spindle dynamics (<A name=3Dbbib16></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib16">Du=20
and Macara, 2004</A>). The fly homolog of Lin-5/NuMA is Mushroom body =
defect=20
(Mud), a large coiled-coil domain protein, which can interact with the=20
N-terminal region of Pins containing seven TPR repeats, and is localized =
to both=20
the apical cortex and centrosomes during mitosis. Loss of <I>mud</I> =
function=20
leads to uncoupling of mitotic spindle with apical crescent in some =
mitotic NBs=20
(<A name=3Dbbib10></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib10">Bowman=20
et al., 2006</A>, <A name=3Dbbib23></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib23">Izumi=20
et al., 2006</A> and <A name=3Dbbib44></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib44">Siller=20
et al., 2006</A>). Thus, it appears that Pins can align the mitotic =
spindle=20
along the apical-basal axis through direct interactions with the=20
microtubule-associated adaptor protein Mud (<A name=3Dbbib10></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib10">Bowman=20
et al., 2006</A>, <A name=3Dbbib23></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib23">Izumi=20
et al., 2006</A> and <A name=3Dbbib44></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib44">Siller=20
et al., 2006</A>).
<P>Not only the apical proteins are able to orient the mitotic spindle, =
this=20
interaction is not a one-way street, as recent study suggests that a=20
microtubule-dependent pathway can also asymmetrically localize apical =
proteins=20
such as Pins/G=CE=B1i in metaphase NBs (<A name=3Dbbib42></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib42">Siegrist=20
and Doe, 2005</A>). How does the microtubule-dependent pathway exert its =

function at the cellular cortex during metaphase? Kinesin heavy chain 73 =

(Khc-73), a microtubule-based plus-end motor protein, plays an important =
role,=20
as it can interact with cortical protein Dlg in vivo. Through this =
interaction,=20
Khc-73 may act to change the conformation of Dlg: in the absence of =
Khc-73, the=20
GK domain of Dlg can bind intramolecularly to its SH3 domain, whereas in =
the=20
presence of Khc-73, the GK domain may preferentially associate with the =
Khc-73=20
MAGUK binding site (MBS), freeing the SH3 domain to bind Pins in an=20
intermolecular interaction. How might Khc-73 function in vivo? One model =
is as=20
follows: at metaphase, Khc-73 present at the plus end of astral =
microtubules can=20
cluster Dlg to one side of the cortex. Then the Khc-73 bound Dlg =
proteins expose=20
their SH3 domains and interact with Pins, thereby localizing =
Pins/G=CE=B1i=20
asymmetrically.
<P>The Dlg/Khc-73/microtubule pathway is primarily active at metaphase, =
whereas=20
the Insc/Par pathway used to localize Pins/G=CE=B1i at the apical cortex =
is active=20
prior to metaphase. When the Insc/Par pathway is inactivated, =
Pins/G=CE=B1i are=20
uniformly localized around the cell cortex prior to metaphase. However, =
the=20
Dlg/Khc-73/microtubule pathway can act independently of Insc/Par to =
induce=20
Pins/G=CE=B1i crescent at metaphase. Although the Pins/G=CE=B1i crescent =
is formed=20
overlying one of the centrosomes, its position along the cortex is =
randomized=20
and not restricted to the normal apical side, leading to formation of a=20
misoriented spindles. When the Dlg/Khc-73/microtubule pathway is =
inactivated,=20
Pins/G=CE=B1i can be recruited to the apical cortex by the Insc/Par =
complex, as in=20
wild-type NBs. Yet, the apical Pins/G=CE=B1i crescent fails to overlie =
one of=20
centrosomes, leading to formation of a misoriented spindle that is =
uncoupled=20
from apical proteins. Only when the microtubule and the Insc/Par =
pathways are=20
simultaneously activated can mitotic spindle oriented along the =
apical-basal=20
axis be coupled to the asymmetric localization of proteins (<A=20
name=3Dbbib42></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib42">Siegrist=20
and Doe, 2005</A>; <A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#fig3">Figure=20
3</A>).=20
<BLOCKQUOTE>
  <P><A name=3Dfig3></A><A name=3D3></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KBDYF1-6&amp;_image=3Dfig3&amp;_ba=3D3&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D9c836b1e7e53eecd401f135bd1e8f9db'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KBDYF1-6&amp;_image=3Dfig3&amp;_ba=3D3=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D9c836b1e7e53eecd401f135bd1e8f9db"><IMG=20
        title=3D"Display Full Size version of this image (45K) - Opens =
new window"=20
        height=3D82 alt=3DImage hspace=3D2=20
        =
src=3D"http://www.sciencedirect.com/cache/MiamiImageURL/B6WSS-4KBDYF1-6-3=
/0?wchp=3DdGLzVlz-zSkzV"=20
        width=3D125 align=3Dmiddle vspace=3D2 border=3D1></A></TD>
      <TD vAlign=3Dbottom><A=20
        title=3D"Display Full Size version of this image (45K) - Opens =
new window"=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KBDYF1-6&amp;_image=3Dfig3&amp;_ba=3D3&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D9c836b1e7e53eecd401f135bd1e8f9db'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KBDYF1-6&amp;_image=3Dfig3&amp;_ba=3D3=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D9c836b1e7e53eecd401f135bd1e8f9db"=20
        alt=3D"Display Full Size version of this image (45K) - Opens new =
window">Display=20
        Full Size version of this image</A> =
(45K)</TD></TR></TBODY></TABLE>
  <P>Figure 3.&nbsp;Both Insc/Par and Dlg/Khc-73 Are Required for =
Pins/G=CE=B1i=20
  Crescent Formation and Spindle Alignment
  <P>In the wild-type NB, Insc/Par (red crescent) and Pins/G=CE=B1i =
(blue crescent)=20
  are colocalized at the apical cortex during prophase/metaphase and =
overlie the=20
  apical centrosome. In <I>insc</I> mutant NBs, during prophase =
Pins/G=CE=B1i (blue)=20
  is localized uniformly around the cortex and becomes a randomly placed =

  crescent overlying one centrosome during metaphase. In <I>dlg</I> or=20
  <I>khc-73</I>-RNAi mutants, the Pins/G=CE=B1i crescent forms during=20
  prophase/metaphase, but the mitotic spindle becomes uncoupled during=20
  metaphase. In mutant NBs lacking <I>insc</I>/<I>dlg</I> or=20
  <I>insc</I>/<I>khc-73</I>, Pins/G=CE=B1i fails to form a crescent =
during metaphase,=20
  suggesting that Pins crescent formation and spindle alignment require =
both=20
  pathways. Centrosomes are represented as green dots.=20
  <P></P></BLOCKQUOTE>
<P>This model of the microtubule/Khc-73/Dlg pathway helps to explain how =

Pins/G=CE=B1i forms a crescent at metaphase in <I>insc</I> mutants. =
Moreover, this=20
model may also explain how spindle rotation occurs at metaphase in the =
wild-type=20
situation. When Khc-73/Dlg and Dlg/Pins complexes form at the apical =
cortex,=20
Khc-73 may depolymerize astral microtubules at their plus ends to pull =
one of=20
the centrosomes toward the apical side. It's a mechanism similar to=20
kinetochore-attached kinesin acting as a microtubule-destabilizing =
enzyme to=20
disassemble tubulin monomers at the plus ends of kinetochore =
microtubules and=20
thereby generate a pulling force leading to sister chromatid separation =
at=20
anaphase (<A name=3Dbbib36></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib36">Rogers=20
et al., 2004</A>). The potential role of Khc-73 as a microtubule =
depolymerase=20
remains to be determined in <I>Drosophila</I> NBs.
<P>But how is a particular centrosome chosen to migrate toward the =
apical end?=20
Previous studies showed that a basally positioned interphase centrosome =
can=20
cause an anticlockwise spindle rotation, whereas an apically positioned=20
interphase centrosome frequently leads to a clockwise spindle rotation =
at=20
metaphase (<A name=3Dbbib25></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib25">Kaltschmidt=20
et al., 2000</A>). The mechanisms underlying this phenomenon are =
currently=20
unknown. One possibility is that the two centrosomes in a mitotic NB may =
be=20
intrinsically different. For example, the mother centrosome may produce =
more=20
astral microtubules than the daughter centrosome, reminiscent of budding =
yeast=20
division (<A name=3Dbbib50></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib50">Wang=20
et al., 2003</A>). At metaphase, the mother centrosome may =
preferentially=20
migrate to the apical side by actively emanating its astral microtubules =
to=20
capture the apical cortex. It would be of great interest to determine =
whether in=20
mitotic NB such a mechanism exists and whether the apical daughter NB=20
consistently inherits the mother centrosome following each round of =
asymmetric=20
cell division.
<P>In summary, at least two mechanisms, mediated by Khc-73/Dlg and Mud, =
can=20
contribute to spindle orientation during NB asymmetric cell division. In =
the=20
case of <I>khc-73/dlg</I> or <I>mud</I> mutants, each exhibit low =
penetrance in=20
spindle-orientation defects. It remains possible that double-stranded =
RNA=20
interference of <I>khc-73</I> only reduces its protein level, and =
maternal=20
components of <I>mud</I> may compensate for its zygotic loss. It is also =

possible that Dlg/Khc-73 and Mud may synergistically align mitotic =
spindle, and=20
each may compensate for defects in the other.<A name=3Dsec1.4></A>
<H4 class=3Dh4>Asymmetric Cell Division Coordinates Proliferation and=20
Differentiation</H4>
<P>During <I>Drosophila</I> neurogenesis, a NB divides to produce a=20
proliferating NB (regenerative) and a GMC daughter cell that terminally=20
differentiates. This process is tightly controlled, and disrupting these =

asymmetric cell divisions can lead to both uncontrolled proliferation =
and=20
aberrant terminal differentiation (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#fig4">Figure=20
4</A>). Several recent studies provide insights into how this process is =

regulated during development and how its misregulation may contribute to =
the=20
tumor formation (<A name=3Dbbib8></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib8">Betschinger=20
et al., 2006</A>, <A name=3Dbbib13></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib13">Caussinus=20
and Gonzalez, 2005</A>, <A name=3Dbbib28></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib28">Lee=20
et al., 2006a</A> and <A name=3Dbbib29></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib29">Lee=20
et al., 2006b</A>). For example, transplantation studies revealed that =
mutant=20
larval brain tissue from <I>pins</I>, <I>mira</I>, <I>numb</I>, or =
<I>pros</I>=20
when transplanted into wild-type adult abdomen grows to sizes more than =
100-fold=20
larger than control wild-type transplants (<A name=3Dbbib13></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib13">Caussinus=20
and Gonzalez, 2005</A>). NBs, which are highly enriched in the =
transplanted=20
mutant tissue, exhibits genomic instability and altered centrosome, =
which likely=20
contribute to the observed uncontrolled proliferation. Strikingly, the=20
transplanted NBs can form malignant tumors that migrate away from the=20
implantation site to invade neighboring tissues. These studies support =
the=20
notion that at least some tumors may be derived from mutant =
stem/progenitor=20
cells.=20
<BLOCKQUOTE>
  <P><A name=3Dfig4></A><A name=3D4></A>
  <TABLE width=3D"100%">
    <TBODY>
    <TR>
      <TD width=3D"10%"><A=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KBDYF1-6&amp;_image=3Dfig4&amp;_ba=3D4&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D5ae6a2f244ceef7fb86297464655e9e3'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KBDYF1-6&amp;_image=3Dfig4&amp;_ba=3D4=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D5ae6a2f244ceef7fb86297464655e9e3"><IMG=20
        title=3D"Display Full Size version of this image (46K) - Opens =
new window"=20
        height=3D93 alt=3DImage hspace=3D2=20
        =
src=3D"http://www.sciencedirect.com/cache/MiamiImageURL/B6WSS-4KBDYF1-6-7=
/0?wchp=3DdGLzVlz-zSkzV"=20
        width=3D92 align=3Dmiddle vspace=3D2 border=3D1></A></TD>
      <TD vAlign=3Dbottom><A=20
        title=3D"Display Full Size version of this image (46K) - Opens =
new window"=20
        =
onclick=3D"openStrippedNS('/science?_ob=3DMiamiCaptionURL&amp;_method=3Dr=
etrieve&amp;_udi=3DB6WSS-4KBDYF1-6&amp;_image=3Dfig4&amp;_ba=3D4&amp;_use=
r=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=3Dc&amp;=
_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&=
amp;md5=3D5ae6a2f244ceef7fb86297464655e9e3'); return false;"=20
        =
href=3D"http://www.sciencedirect.com/science?_ob=3DMiamiCaptionURL&amp;_m=
ethod=3Dretrieve&amp;_udi=3DB6WSS-4KBDYF1-6&amp;_image=3Dfig4&amp;_ba=3D4=
&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3Dfull&amp;_orig=3Dsearch&amp;view=
=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_use=
rid=3D10&amp;md5=3D5ae6a2f244ceef7fb86297464655e9e3"=20
        alt=3D"Display Full Size version of this image (46K) - Opens new =
window">Display=20
        Full Size version of this image</A> =
(46K)</TD></TR></TBODY></TABLE>
  <P>Figure 4.&nbsp;Asymmetrically Segregated Proteins aPKC and =
Brat/Pros Can=20
  Regulate Proliferation/Differentiation of Daughter Cells Following =
Larval NB=20
  Division
  <P>In the wild-type situation (top row), during cell division a larval =
NB=20
  segregates aPKC (red) to a proliferating NB daughter cell, and =
Brat/Pros=20
  (yellow) to a differentiating GMC daughter cell. Brat/Pros can =
suppress the=20
  expression of cell cycle genes and dMyc in the GMC daughter cell, =
thereby=20
  inducing differentiation. In the double mutants of <I>lgl/pins</I> or=20
  overexpression of a membrane-tethered aPKC (middle row), aPKC is =
segregated=20
  into both daughter cells, leading to a transformation of GMC into=20
  proliferating NB. In the <I>brat</I> or <I>pros</I> mutant larval NBs =
(bottom=20
  row), cell cycle progression and protein synthesis are not inhibited =
in the=20
  GMC, also leading to the transformation of GMC into proliferating NB.=20
  <P></P></BLOCKQUOTE>
<P>How are the proliferation/differentiation capacities of daughter =
cells=20
coordinated following each round of asymmetric cell division? One =
possibility is=20
that NBs use the asymmetric localization/segregation machinery to =
distribute=20
=E2=80=9Cproliferation factors=E2=80=9D to the NB daughter and/or =
=E2=80=9Cdifferentiation factors=E2=80=9D to=20
the GMC daughter during asymmetric cell division. Then what might these =
factors=20
be? Recent work indicates that aPKC is sufficient to promote NB =
self-renewal and=20
that the daughter cell destined to be a NB inherits aPKC and continues =
to=20
proliferate, whereas the GMC daughter cell without aPKC undergoes=20
differentiation (<A name=3Dbbib28></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib28">Lee=20
et al., 2006a</A>). As described above, aPKC preferentially =
phosphorylates and=20
inactivates Lgl on one side of the cell, while nonphosphorylated Lgl at =
the=20
opposite side can positively direct asymmetric localization of Mira/Pros =
and=20
Pon/Numb in both NBs and SOPs (<A name=3Dbbib7></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib7">Betschinger=20
et al., 2003</A> and <A name=3Dbbib31></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib31">Mayer=20
et al., 2005</A>). However, in larval NBs, Lgl appears to negatively =
regulate=20
aPKC activity, which limits its self-renewal ability to the apical =
daughter (NB)=20
by restricting aPKC kinase activity to the apical cortex, inherited by =
the NB=20
daughter. When Lgl is absent, aPKC, although localized nonuniformly, is=20
partially delocalized to the basal cortex in some metaphase larval NBs,=20
resulting in the generation of supernumerary NBs at the expense of =
neurons.=20
Uniform cortical localization of aPKC in the <I>pins lgl</I> double =
mutant leads=20
to the generation of more self-renewing NBs. That is consistent with=20
overexpression of a membrane-tethered aPKC, which localizes uniformly =
around the=20
cortex, which is sufficient to induce NB self-renewal. All of these data =
point=20
to aPKC kinase activity is sufficient for promoting NB self-renewal (<A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#fig4">Figure=20
4</A>; <A name=3Dbbib28></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib28">Lee=20
et al., 2006a</A>).
<P>Concurrently, inhibition of daughter cell proliferation may also be =
achieved=20
by asymmetric segregation of key differentiation factors into the GMC. =
One such=20
factor is the basally locaized Brain Tumor (Brat) (<A =
name=3Dbbib8></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib8">Betschinger=20
et al., 2006</A> and <A name=3Dbbib29></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib29">Lee=20
et al., 2006b</A>). Brat was independently isolated in a genetic screen =
for=20
mutations that increase the number of NBs in larval brain (<A =
name=3Dbbib29></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib29">Lee=20
et al., 2006b</A>) and in a biochemical assay analyzing the basal Mira =
protein=20
complex (<A name=3Dbbib8></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib8">Betschinger=20
et al., 2006</A>). Brat is a translational repressor containing an=20
evolutionarily conserved NHL (NCL-1, HT2A, and LIN-41) domain that =
recruits the=20
Pumilio-Nanos-hunchback mRNA complex through an interaction between its =
NHL=20
domain and Pumilio during early embryogenesis (<A name=3Dbbib46></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib46">Sonoda=20
and Wharton, 2001</A>). In embryonic NBs, Brat colocalizes with Mira at =
the=20
basal cortex as a crescent from prometaphase to telophase. Upon =
cytokinesis,=20
Brat is segregated to the basal GMC and released from the cellular =
cortex. In=20
<I>brat</I> mutant larval brains, supernumerary NBs are produced at the =
expense=20
of neurons. Like wild-type NBs, <I>brat</I> mutant NBs divide =
asymmetrically=20
into two daughter cells of unequal size, but the GMC daughter fails to=20
terminally differentiate. Instead, the mutant =E2=80=9CGMC=E2=80=9D =
continues to grow, enlarge,=20
and express NB markers such as Deadpan and Mira. Moreover, MARCM clones=20
generated from a single larval <I>brat</I> mutant NB form a large number =
of=20
Mira, Worniu, and CycE-positive NBs, indicating that <I>brat</I> =
functions in a=20
cell-autonomous manner (<A name=3Dbbib5></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib5">Bello=20
et al., 2006</A>, <A name=3Dbbib8></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib8">Betschinger=20
et al., 2006</A> and <A name=3Dbbib29></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib29">Lee=20
et al., 2006b</A>). Thus, these data suggest that asymmetric segregation =
of Brat=20
into GMCs is intended to inhibit cellular proliferation.
<P>So how does Brat inhibit GMC proliferation? One possibility is that =
in GMCs=20
Brat acts to inhibit the translation of dMyc protein, an important =
regulator of=20
cell cycle progression and cell growth. dMyc is specifically expressed =
in NBs=20
but not GMCs. Although the role of dMyc in NB proliferation is not yet =
clear,=20
loss of <I>brat</I> function elevates dMyc levels in all daughter cells, =

suggesting that Brat may act as a posttranscriptional inhibitor of dMyc =
in GMCs=20
(<A name=3Dbbib8></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib8">Betschinger=20
et al., 2006</A>).
<P>Similarly to Brat, Pros also functions as a tumor suppressor in =
larval brain=20
(<A name=3Dbbib5></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib5">Bello=20
et al., 2006</A>, <A name=3Dbbib8></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib8">Betschinger=20
et al., 2006</A> and <A name=3Dbbib29></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib29">Lee=20
et al., 2006b</A>; <A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#fig4">Figure=20
4</A>). In fact, there may be some functional relationships between Brat =
and=20
Pros. Brat is required for the asymmetric localization of Pros in larval =
NBs,=20
and in <I>pros</I> mutant clones, Brat expression is downregulated (<A=20
name=3Dbbib8></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib8">Betschinger=20
et al., 2006</A> and <A name=3Dbbib29></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib29">Lee=20
et al., 2006b</A>). Tumorigenesis phenotypes in <I>brat</I> and =
<I>pros</I>=20
larva brain may thus be due to mutual dependency on the =
expression/localization=20
of these two proteins (<A name=3Dbbib8></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib8">Betschinger=20
et al., 2006</A> and <A name=3Dbbib29></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib29">Lee=20
et al., 2006b</A>). Ectopic expression of Pros in <I>brat</I> mutant =
clones can=20
rescue the NB overproliferation phenotype, also suggesting that Brat may =

function through Pros (<A name=3Dbbib5></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib5">Bello=20
et al., 2006</A>). Given that mutations in <I>lgl</I> perturb the =
asymmetric=20
segregation of Pros and Brat and can cause tumor formation in larval =
brains, Lgl=20
may function at least in part by ensuring that Brat and Pros segregate=20
specifically into GMCs (<A name=3Dbbib8></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib8">Betschinger=20
et al., 2006</A>). However, since neither the removal of aPKC nor the=20
overexpression of Lgl3A (a suppressor of aPKC-induced NB =
overproliferation) in=20
<I>brat</I> mutants can rescue the overproliferation defect, these =
results=20
suggest that aPKC may not be required for NB self-renewal in <I>brat</I> =

mutants.
<P>Several interesting questions are raised by these findings. For =
example, what=20
are the NB-specific substrates that are phosphorylated and activated by =
aPKC=20
during NB self-renewal? It is important to determine how the =
aPKC-dependent and=20
Brat/Pros-dependent pathways coordinate to regulate proliferation versus =

differentiation during larval NB cell division.<A name=3Dsec1.5></A>
<H4 class=3Dh4>Implications for Mammalian Stem Cell Biology</H4>
<P>These studies in <I>Drosophila</I> NB have provided some insights to =
our=20
general understanding of how stem and progenitor cells divide, =
proliferate, and=20
differentiate. With more mammalian homologs of fly asymmetric cell =
division=20
machinery being identified, it is now clear that considerable =
mechanistic=20
conservation exists across species. For example, the mammalian =
G=CE=B2=CE=B3 subunit of=20
the heterotrimeric G protein complex and activator of G protein =
signaling-3=20
(AGS3) have been shown to control mitotic spindle orientation and cell =
fate=20
during mouse cortical neurogenesis (<A name=3Dbbib37></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib37">Sanada=20
and Tsai, 2005</A>). Likewise, mammalian aPKC, Par-3, and LGN are =
thought to be=20
involved in asymmetric division of basal epidermal progenitor cells in =
the skin=20
(<A name=3Dbbib27></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib27">Lechler=20
and Fuchs, 2005</A>). The once elusive mammalian homolog of the fly =
<I>insc</I>=20
has also been cloned (<A name=3Dbbib26></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib26">Katoh=20
and Katoh, 2003</A>, <A name=3Dbbib27></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib27">Lechler=20
and Fuchs, 2005</A> and <A name=3Dbbib57></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib57">Zigman=20
et al., 2005</A>). Although its role in mammalian asymmetric cell =
division is=20
not yet clear, it is be reasonable to suspect that mammalian <I>insc</I> =
plays=20
similarly important roles during progenitor cell division. These results =
make=20
the point that asymmetric cell division is a fundamental process that =
regulates=20
stem/progenitor cell division and fate determination, and it is likely =
that more=20
examples of mechanistic conservation will come out of future studies of =
such=20
mammalian homologs.
<P>Beyond developmental biology, there has been considerable recent =
interest in=20
stem cells and cancer. Not only is it hypothesized that oncogenic =
mutations in=20
adult stem cells can give rise to cancer, but that some tumors may =
actually be=20
propagated at the core by slowly dividing =E2=80=9Ctumor stem =
cells=E2=80=9D (<A=20
name=3Dbbib11></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib11">Brabletz=20
et al., 2005</A> and <A name=3Dbbib18></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib18">Feinberg=20
et al., 2006</A>). Although these ideas make attractive models, there =
remains=20
one universal property of stem cells, which is the ability for =
self-renewal.=20
Therefore, oncogenic mutations in stem cells that limit self-renewal are =

unlikely to generate cancer stem cells. Similarly, oncogenic mutations =
in=20
differentiated cells which gained the ability to self renew may give =
rise to=20
cancer stem cells. As we have discussed, since asymmetric cell division =
governs=20
self-renewal and differentiation of stem cells, it is conceivable that =
mutations=20
in part of this machinery maybe linked to tumor formation.
<P>By showing that Brat and Prospero asymmetrically segregate during fly =

neuroblast division to inhibit the self-renewal capacity of one daughter =
cell=20
(<A name=3Dbbib8></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib8">Betschinger=20
et al., 2006</A> and <A name=3Dbbib29></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib29">Lee=20
et al., 2006b</A>), these investigators established a mechanism of =
action=20
between asymmetric cell division and cell proliferation. <A =
name=3Dbbib8></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib8">Betschlinger=20
et al. (2006)</A>, then went on to demonstrate Brat's inhibitory action =
on dMyc=20
(the fly homolog of the mammalian oncogene MYC), thereby showing a =
possible link=20
between asymmetric cell division and oncogenesis. Although these results =
are=20
very exciting, the upregulation of dMyc in the absence of Brat leaves =
several=20
unanswered questions. It is not clear if Brat directly inhibits=20
posttranslational inhibition of <I>dMyc</I> or if the observed dMyc =
upregulation=20
results from other processes, such as extracellular signals, that drive =
cellular=20
proliferation. The MYC transcription factor responds to many cellular =
signals=20
that govern proliferation; thus, loss of Brat inhibition may represent =
only part=20
of the cascade that leads to dMyc activation in Brat mutant daughter =
cells.=20
Future experiments will be needed to fully elucidate this interaction.
<P>If mutations in the asymmetric cell division pathway that =
downregulate=20
proliferative capacity can indeed lead to stem cell hyperproliferation =
and=20
cancer, one might expect to find genetic mutations in the mammalian =
homologs of=20
Brat and Prospero in mammalian tumors. Very little is known about the =
putative=20
Brat mammalian homolog Tripartite motif proteins (Trim2, 3, and 32) in =
cellular=20
proliferation (<A name=3Dbbib49></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib49">van=20
Diepen et al., 2005</A>), but the Prospero homolog Prospero-related =
homeobox 1=20
(Prox1) has conserved functions in regulating retinal progenitor cell=20
proliferation (<A name=3Dbbib17></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib17">Dyer=20
et al., 2003</A>). Prox1 expression can force retinal progenitor cells =
to exit=20
the cell cycle and differentiate (<A name=3Dbbib17></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib17">Dyer=20
et al., 2003</A>). In addition, mutations in and aberrant DNA =
methylation of=20
<I>prox1</I> have been observed in some liver tumors and lymphomas (<A=20
name=3Dbbib32></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib32">Nagai=20
et al., 2003</A> and <A name=3Dbbib40></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bib40">Schneider=20
et al., 2006</A>). Although the number of such reported cases are few =
and=20
despite the fact that Prox1 has so far not been implicated in mammalian=20
asymmetric cell division, more investigators looking in the right places =
may=20
eventually shed light on the links between asymmetric cell division, =
stem cell=20
proliferation, and cancer. </P></DIV><BR>
<DIV class=3Dart><A name=3Dbibl001></A>
<H3 class=3Dh3>References</H3>
<P><A name=3Dbib1></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bbib1">Afshar=20
et al., 2004</A> K. Afshar, F.S. Willard, K. Colombo, C.A. Johnston, =
C.R.=20
McCudden, D.P. Siderovski and P. Gonczy, <I>Cell</I> =
<STRONG>119</STRONG>=20
(2004), pp. 219=E2=80=93230. <A=20
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summary&amp;_orig=3Dsearch&amp;_cdi=3D7051&amp;view=3Dc&amp;_acct=3DC0000=
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162b89506f8b52fc34de43b7dfc28&amp;ref=3Dfull">SummaryPlus</A>=20
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B6WSN-4DJ98FK-B&amp;_user=3D10&amp;_coverDate=3D10%2F15%2F2004&amp;_fmt=3D=
full&amp;_orig=3Dsearch&amp;_cdi=3D7051&amp;view=3Dc&amp;_acct=3DC0000502=
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894ebb759294d9a719b2a3c2b6&amp;ref=3Dfull"><B>Full=20
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<P><A name=3Dbib2></A><A=20
href=3D"http://www.sciencedirect.com/science?_ob=3DArticleURL&amp;_udi=3D=
B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bbib2">Afshar=20
et al., 2005</A> K. Afshar, F.S. Willard, K. Colombo, D.P. Siderovski =
and P.=20
Gonczy, <I>Development</I> <STRONG>132</STRONG> (2005), pp. =
4449=E2=80=934459. <A=20
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;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
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;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
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c76b616568690d9ee9b0d4"=20
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href=3D"http://www.sciencedirect.com/science?_ob=3DRedirectURL&amp;_metho=
d=3DoutwardLink&amp;_partnerName=3D656&amp;_targetURL=3Dhttp%3A%2F%2Fwww.=
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scopus.com%2Fscopus%2Finward%2Fcitedby.url%3Feid%3D2-s2.0-33744794908%26p=
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scopus.com%2Fscopus%2Finward%2Fcitedby.url%3Feid%3D2-s2.0-0035513733%26pa=
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summary&amp;_orig=3Dsearch&amp;_cdi=3D6243&amp;view=3Dc&amp;_acct=3DC0000=
50221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D0c7=
bdfb2e2e8d4357e99ae7647143ba8&amp;ref=3Dfull">SummaryPlus</A>=20
| <A=20
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ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
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ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
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d=3DoutwardLink&amp;_partnerName=3D656&amp;_targetURL=3Dhttp%3A%2F%2Fwww.=
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d=3DoutwardLink&amp;_partnerName=3D656&amp;_targetURL=3Dhttp%3A%2F%2Fwww.=
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ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
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ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
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;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
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;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
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1ee#bbib39">Schaefer=20
et al., 2001</A> M. Schaefer, M. Petronczki, D. Dorner, M. Forte and =
J.A.=20
Knoblich, <I>Cell</I> <STRONG>107</STRONG> (2001), pp. 183=E2=80=93194. =
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ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
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d=3DoutwardLink&amp;_partnerName=3D656&amp;_targetURL=3Dhttp%3A%2F%2Fwww.=
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7814e620308afb076856e25"=20
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ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
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onclick=3D"var outwardWin; =
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B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
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B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
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1ee#bbib43">Siegrist=20
and Doe, 2006</A> S.E. Siegrist and C.Q. Doe, <I>Development</I>=20
<STRONG>133</STRONG> (2006), pp. 529=E2=80=93536. <A=20
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d=3DoutwardLink&amp;_partnerName=3D656&amp;_targetURL=3Dhttp%3A%2F%2Fwww.=
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B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bbib44">Siller=20
et al., 2006</A> K.H. Siller, C. Cabernard and C.Q. Doe, <I>Nat. Cell =
Biol.</I>=20
<STRONG>8</STRONG> (2006), pp. 594=E2=80=93600. <A=20
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B6WSS-4KBDYF1-6&amp;_user=3D10&amp;_rdoc=3D1&amp;_fmt=3D&amp;_orig=3Dsear=
ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D279c456973a8c482d652d82d3c41d=
1ee#bbib45">Somers=20
and Chia, 2005</A> W.G. Somers and W. Chia, <I>Dev. Cell</I> =
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(2005), pp. 312=E2=80=93313. <A=20
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B6WW3-4H21R5S-4&amp;_user=3D10&amp;_coverDate=3D09%2F30%2F2005&amp;_fmt=3D=
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onclick=3D"var outwardWin; =
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d=3DoutwardLink&amp;_partnerName=3D656&amp;_targetURL=3Dhttp%3A%2F%2Fwww.=
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B6WNB-4FJKWRJ-9&amp;_user=3D10&amp;_coverDate=3D05%2F31%2F2005&amp;_fmt=3D=
summary&amp;_orig=3Dsearch&amp;_cdi=3D6958&amp;view=3Dc&amp;_acct=3DC0000=
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21&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D79176c=
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ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
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target=3DoutwardLink>Cited By in Scopus (20)</A>
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onclick=3D"var outwardWin; =
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scopus.com%2Fscopus%2Finward%2Frecord.url%3Feid%3D2-s2.0-0033518223%26par=
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29fbc70657709c7739861"=20
target=3DoutwardLink>View Record in Scopus</A> | <A=20
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yes,width=3D610,height=3D480,screenX=3D10,screenY=3D10'); =
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d=3DoutwardLink&amp;_partnerName=3D656&amp;_targetURL=3Dhttp%3A%2F%2Fwww.=
scopus.com%2Fscopus%2Finward%2Fcitedby.url%3Feid%3D2-s2.0-0033518223%26pa=
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422d98207c8a2e2f198a0e4f1a208&amp;ref=3Dfull">SummaryPlus</A>=20
| <A=20
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yes,width=3D610,height=3D480,screenX=3D10,screenY=3D10'); =
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d=3DoutwardLink&amp;_partnerName=3D656&amp;_targetURL=3Dhttp%3A%2F%2Fwww.=
scopus.com%2Fscopus%2Finward%2Fcitedby.url%3Feid%3D2-s2.0-0034681261%26pa=
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ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
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scopus.com%2Fscopus%2Finward%2Fcitedby.url%3Feid%3D2-s2.0-0041977037%26pa=
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ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
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onclick=3D"var outwardWin; =
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d=3DoutwardLink&amp;_partnerName=3D656&amp;_targetURL=3Dhttp%3A%2F%2Fwww.=
scopus.com%2Fscopus%2Finward%2Fcitedby.url%3Feid%3D2-s2.0-22344436242%26p=
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ch&amp;_sort=3Dd&amp;view=3Dc&amp;_acct=3DC000050221&amp;_version=3D1&amp=
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and J.A. Knoblich, <I>Neuron</I> <STRONG>48</STRONG> (2005), pp. =
539=E2=80=93545. <A=20
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50221&amp;_version=3D1&amp;_urlVersion=3D0&amp;_userid=3D10&amp;md5=3D40f=
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| <A=20
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------=_NextPart_000_0073_01C8636C.FAB394F0
Content-Type: text/css;
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Content-Transfer-Encoding: quoted-printable
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* {
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BLOCKQUOTE A {
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P {
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}

------=_NextPart_000_0073_01C8636C.FAB394F0
Content-Type: text/css;
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Content-Transfer-Encoding: quoted-printable
Content-Location: http://www.sciencedirect.com/science/page/static/stylesheets/css_gen_v01.css

BODY {
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DIV {
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}
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}
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}
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}
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}
TABLE.sdMainNav {
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WIDTH: 100%; BORDER-BOTTOM: black 0.1em solid; BACKGROUND-REPEAT: =
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}
TD.sdMainNav {
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}
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}
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}
TABLE.sdMainNav A:link {
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COLOR: white; PADDING-TOP: 0.19em; HEIGHT: 1.82em; TEXT-DECORATION: none
}
TABLE.sdMainNav A:visited {
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}
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}
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BACKGROUND-COLOR: #777777
}
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}
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}
INPUT.btn {
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#666666 1px solid; PADDING-LEFT: 1px; FONT-WEIGHT: bold; FONT-SIZE: =
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CURSOR: pointer; COLOR: #ffffff; PADDING-TOP: 0px; BORDER-BOTTOM: =
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}
INPUT.btnhov {
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CURSOR: pointer; PADDING-TOP: 0px; BORDER-BOTTOM: #666666 1px solid; =
TEXT-DECORATION: none
}
A.articleBtn {
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none; PADDING-LEFT: 20px; FONT-WEIGHT: bold; FONT-SIZE: 12px; =
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BACKGROUND-COLOR: #999999; TEXT-DECORATION: none
}
A.articleBtn:hover {
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}
A.articleBtnActive {
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}
A.articleBtnActive:hover {
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}
A.articleBtn:hover {
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}
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}
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}
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}
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}
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}
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}
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}
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}
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A.redBtn {
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}
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A.orangeBtn {
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}
A.orangeBtn:hover {
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}
A.noul:hover {
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}
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PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-TOP: 0px; BORDER-BOTTOM: =
#8cc919 2px solid; BACKGROUND-COLOR: #efefef
}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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	BORDER-BOTTOM: #cc5200 2px solid
}
.tableFmBgGray {
	FONT-SIZE: 1em; FONT-FAMILY: arial, helvetica, sans-serif; =
BACKGROUND-COLOR: #efefef
}
.tableFmBgGrayNoCell {
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5px; MARGIN: 5px; PADDING-TOP: 5px; FONT-FAMILY: arial, helvetica, =
sans-serif; BACKGROUND-COLOR: #efefef
}
.tableFmBgPad {
	MARGIN-TOP: 5px; MARGIN-BOTTOM: 5px; PADDING-BOTTOM: 5px; PADDING-TOP: =
5px; BACKGROUND-COLOR: #efefef
}
.tableFmCell {
	PADDING-LEFT: 10px; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; =
MARGIN-LEFT: 10px; VERTICAL-ALIGN: top; PADDING-TOP: 3px; TEXT-ALIGN: =
right
}
.tableFmCellTop {
	FONT-WEIGHT: bold; VERTICAL-ALIGN: top; PADDING-TOP: 0px; TEXT-ALIGN: =
right
}
.tableFmCellAbove {
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PADDING-BOTTOM: 5px; PADDING-TOP: 5px; TEXT-ALIGN: left
}
.tableFmCellL {
	PADDING-LEFT: 10px; FONT-WEIGHT: bold; PADDING-BOTTOM: 3px; =
MARGIN-LEFT: 10px; VERTICAL-ALIGN: top; PADDING-TOP: 3px; TEXT-ALIGN: =
left
}
.tableFmDivider {
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0px; WIDTH: 100%; PADDING-TOP: 0px; HEIGHT: 2px; BACKGROUND-COLOR: =
#ffffff
}
.redtableFmDivider {
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0px; WIDTH: 100%; PADDING-TOP: 0px; HEIGHT: 2px; BACKGROUND-COLOR: =
#990000
}
.SDtxtLarger {
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sans-serif
}
.SDtxtSmall {
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sans-serif
}
.SDtxtSmallBold {
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}
.SDtxtNote {
	FONT-SIZE: 1em; COLOR: #000000; FONT-FAMILY: arial, helvetica, =
sans-serif
}
.SDtxtNoteSmall {
	FONT-SIZE: 10px; COLOR: #000000; FONT-FAMILY: arial, helvetica, =
sans-serif
}
.SDtxtPgTitleBlack {
	FONT-WEIGHT: bold; FONT-SIZE: 150%; COLOR: #000000; FONT-FAMILY: arial, =
helvetica, sans-serif
}
A.errMsg {
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}
A.errMsg:hover {
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}
.boldText {
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}
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}
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}
.greenColor {
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}
.greyColor {
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}
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}
.orangeColor {
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}
.tablePlainWhite {
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PADDING-TOP: 0px; BACKGROUND-COLOR: #ffffff
}
.inputBox {
	BORDER-RIGHT: #666666 1px solid; BORDER-TOP: #666666 1px solid; =
FONT-SIZE: 1em; VERTICAL-ALIGN: top; BORDER-LEFT: #666666 1px solid; =
BORDER-BOTTOM: #666666 1px solid; BACKGROUND-COLOR: #ffffff
}
A.tabActive {
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none; PADDING-LEFT: 20px; FONT-WEIGHT: bold; FONT-SIZE: 1em; =
PADDING-BOTTOM: 1px; MARGIN: 0px 2px 0px 0px; BORDER-LEFT: medium none; =
COLOR: #ffffff; PADDING-TOP: 1px; BORDER-BOTTOM: medium none; =
TEXT-DECORATION: none
}
A.tabActive:hover {
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none; PADDING-LEFT: 20px; FONT-WEIGHT: bold; FONT-SIZE: 1em; =
PADDING-BOTTOM: 1px; MARGIN: 0px 2px 0px 0px; BORDER-LEFT: medium none; =
COLOR: #ffffff; PADDING-TOP: 1px; BORDER-BOTTOM: medium none; =
TEXT-DECORATION: none
}
A.tab {
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none; PADDING-LEFT: 20px; FONT-WEIGHT: bold; FONT-SIZE: 1em; =
PADDING-BOTTOM: 1px; MARGIN: 0px 2px 0px 0px; BORDER-LEFT: medium none; =
COLOR: #ffffff; PADDING-TOP: 1px; BORDER-BOTTOM: medium none; =
BACKGROUND-COLOR: #999999; TEXT-DECORATION: none
}
A.tab:hover {
	BORDER-RIGHT: medium none; PADDING-RIGHT: 20px; BORDER-TOP: medium =
none; PADDING-LEFT: 20px; FONT-WEIGHT: bold; FONT-SIZE: 1em; =
PADDING-BOTTOM: 1px; MARGIN: 0px 2px 0px 0px; BORDER-LEFT: medium none; =
COLOR: #ffffff; PADDING-TOP: 1px; BORDER-BOTTOM: medium none; =
BACKGROUND-COLOR: #999999; TEXT-DECORATION: none
}
A.sci_dirTabActive {
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}
A.sci_dirTabActive:hover {
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}
A.sci_dirTab:hover {
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}
A.blueTabActive {
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}
A.blueTabActive:hover {
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}
A.blueTab:hover {
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}
A.greenTabActive {
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}
A.greenTabActive:hover {
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