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<p>According to the <a href="page.php?w=French_Flag_model">French Flag model</a> where stages of development are directed by gene product gradients, several genes are considered important for inducing patterns in the open neural plate, especially for the development of <a href="page.php?w=neurogenic_placodes">neurogenic placodes</a>. These placodes first become evident histologically in the open neural plate. After <a href="page.php?w=sonic_hedgehog">sonic hedgehog</a> (SHH) signalling from the notochord induces its formation, the floor plate of</p><p>
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