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Fig. 2. Expression of gdnf receptor components in enteric precursors. Shown are ventral views of the vagal region of 36 hpf embryos after the yolk has been removed. Anterior is towards the left. In situ hybridization was performed for crestin (A), phox2b (B), gfra1a (C), gfra1b (D), ret (E) and gdnf (F). White arrows (A-E) indicate the anterior end of the gut tube. Black arrows in F indicate the mesendodermal expression of gdnf at the anterior end of the gut tube.