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Fig. 1. Normal development of the peripheral nervous system in cultured
embryos. E8.5 mouse embryos (A) were cultured for 3 days and
processed for whole-mount in situ hybridisation with a Ret-specific
riboprobe (B). In situ hybridisation of a freshly dissected E10.5
embryo (C). In both cases, Ret expression is observed in the
VII, IX and X cranial sensory ganglia and in the stomach (st) and midgut (mg).
The asterisk in A marks the approximate site of cell grafting (see text, and
legend to Fig. 2). Arrows
indicate enteric neural crest cells (NCCs) within the gut of cultured (B) and
freshly dissected (C) embryos.