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Fig. 4
Expression of shh and satb2 correlate spatially during pharyngeal arch development.
(A–D) Dorsal-lateral views of 30 hpf and 32 hpf wild-type embryos. (A) shha expression initiates in the pharyngeal endoderm at 30 hpf while (B) satb2 is not expressed in the craniofacial region at this time. (C, arrows) By 32 hpf shh expression has intensified and can be seen to arc around the presumptive arches. (D, arrows) satb2 expression is initiated in the ventral arch by 32 hpf and lies in close proximity to the presumptive pharyngeal endoderm.
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