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In the forebrain, reelin was highly expressed in the olfactory bulb, septal nuclei, and subpial neurons in the marginal zone of the cerebral cortex, dorsal ventricular ridge, and basal forebrain. At early stages, reelin mRNA was also detected in subventricular zones. In the diencephalon, the ventral lateral geniculate nuclei and reticular nuclei were strongly positive, with moderate expression in the habenula and focal expression in the hypothalamus. High expression levels were noted in the retina, the tectum, and the external granule cell layer of the cerebellum. In the brainstem, there was a high level of signal in cochleovestibular, sensory trigeminal, and some reticular nuclei. No expression was observed in the cortical plate or Purkinje cells. Comparison with reelin expression during brain development in mammals, birds, turtles, and lizards reveals evolutionarily conserved, homologous features that presumably define the expression profile in stem amniotes. The crocodilian cortex contains subpial reelin\u2010positive cells that are also p73 positive, suggesting that they are homologous to mammalian Cajal\u2010Retzius cells, although they express the reelin gene less intensely. Furthermore, the crocodilian cortex does not contain the subcortical reelin\u2010positive cells that are typical of lizards but expresses reelin in subventricular zones at early stages. These observations confirm that reelin is prominently expressed in many structures of the embryonic brain in all amniotes and further emphasize the unique amplification of reelin expression in mammalian Cajal\u2010Retzius cells and its putative role in the evolution of the cerebral cortex. J. Comp. Neurol. 457:250\u2013262, 2003. \u00a9 2003 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/cne.10573","type":"journal-article","created":{"date-parts":[[2003,1,23]],"date-time":"2003-01-23T13:55:40Z","timestamp":1043330140000},"page":"250-262","source":"Crossref","is-referenced-by-count":54,"title":["Reelin expression during embryonic brain development in <i>Crocodylus niloticus<\/i>"],"prefix":"10.1002","volume":"457","author":[{"given":"F.","family":"Tissir","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C.","family":"Lambert De 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