A) H&amp;E staining of <b>chicken</b> optic tectum at HH30(E7) showing the generative zone (GZ), the migrating zone (MZ) and the first neuronal lamina (L1). Scale bar 200 μm.   Caltharp et al. BMC Developmental Biology 2007 7:32  <a href="//doi.org/10.1186/1471-213X-7-32" class="extiw" title="doi:10.1186/1471-213X-7-32">doi:10.1186/1471-213X-7-32</a>
<ul><li><a href="//commons.wikimedia.org/wiki/File:NOGO-A_expression_during_cell_migration.jpg" title="File:NOGO-A expression during cell migration.jpg">NOGO-A_expression_during_cell_migration.jpg</a>: Caltharp SA, Pira CU, Mishima N, Youngdale EN, McNeill DS, Liwnicz BH, Oberg KC</li>
<li>derivative work: <a href="//commons.wikimedia.org/wiki/User:CopperKettle" title="User:CopperKettle">CopperKettle</a> (<a href="//commons.wikimedia.org/wiki/User_talk:CopperKettle" title="User talk:CopperKettle"><span class="signature-talk">talk</span></a>)</li></ul>
<ul><li><a href="//commons.wikimedia.org/wiki/File:NOGO-A_expression_during_cell_migration.jpg" title="File:NOGO-A expression during cell migration.jpg">NOGO-A_expression_during_cell_migration.jpg</a></li></ul>