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Fig. 11 In 2-dpf wild-type larvae shh is expressed in the endoderm, floor plate, and brain, as well as in the second arch (A, C). Ventral views of wild-type (A) and vgo (B) embryos show that the endodermal expression domain of shh is shortened along the A-P axis in vgo and that in some vgo embryos expression in the second pharyngeal arch (p2) is absent. Lateral views of wild-type (C) and vgo (D) embryos show that in vgo the pharynx does not form a tube but remains a thin layered sheet of cells.
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Reprinted from Developmental Biology, 225(2), Piotrowski, T. and Nüsslein-Volhard, C., The endoderm plays an important role in patterning the segmented pharyngeal region in zebrafish (Danio rerio), 339-356, Copyright (2000) with permission from Elsevier. Full text @ Dev. Biol.