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Fig. 4 Enteric nervous system and gut endoderm mRNA expression of zebrafish GDNF, GFRα1, and RET at 72 hpf. (A–D) Lateral view of the trunk of 72 hpf embryos from somites 9–13 that have been hybridized with GDNF (A), GFRα1a (B), GFRα1b (C), and RET (D) riboprobes. Y, yolk sac extension. Arrows in (A) indicate gut endoderm. Arrows in (B–D) indicate enteric neuron processors in the gut endoderm. Rostral is to the left. Scale bar: 50 μm.
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Reprinted from Developmental Biology, 231(2), Shepherd, I.T., Beattie, C.E., and Raible, D.W., Functional analysis of zebrafish GDNF, 420-435, Copyright (2001) with permission from Elsevier. Full text @ Dev. Biol.