Fig. 8

Apical-basal organization of neuroectoderm. a and b ELAV-expressing cells are found deep in the ectoderm from the time of earliest detection (a: stage 7; b: stage 8). c and d Expression patterns of NEUROG (c) and NEUROD (d) at stage 8. Cross sections illustrated are taken from the palliovisceral cord (see dotted line in Fig. 7a). The asterisks and arrowheads indicate putative neurogenic ectoderm apically and the basal site of neuronal differentiation, respectively. Scale bar: 20 μm