part_of part of part of only in taxon develops from existence starts during Craniata <chordates> neurula stage neural crest http://upload.wikimedia.org/wikipedia/commons/5/5f/Gray644.png https://upload.wikimedia.org/wikipedia/commons/8/8f/Neural_Crest.png Gene notes: Many factors and genes, such as Pax3 (Tremblay et al., 1995), slug (Nieto et al., 1994), AP-2 (Zhang et al., 1996; Schorle et al., 1996), and Wnt-1/3a (Ikeya et al., 1997) are expressed in the dorsal most region of the neural tube, and have been shown to be involved in the generation of neural crest cells. consider including subclasses for pre- and post- migratory (e.g. sheets/paths/streams). neurectoderm neural plate ectoderm-derived structure neural fold structure with developmental contribution from neural crest germ layer / neural crest