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Expression of BMP-4, BMP-7, Wnt-13, and Shh relative to MyoD and Myf-5 in the branchial arches. (A-F). Whole-mount in situ hybridization of stage 17-20 chick embryos for the indicated genes shown in the branchial arch (BA) region (lateral views, dorsal to the left, anterior to the top). (A′-F′) Frontal sections at levels designated by dashed lines in embryos depicted in A-F for the indicated genes in the BA region. (I and II marks the 1st and 2nd BAs, respectively).
