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Fig. 8. Cbfa1 expression in the branchial arches. Cbfa1 expression was analyzed by in situ hybridization on wild-type (A), Hoxa2-/- (B) and Hoxa2-/-;Ptx1-/- (C) E11.5 embryos. The asterisks indicate the location of the external acoustic meatus (in the first pharyngeal cleft). The arrow indicates the extra domain of Cbfa1 expression in the second arch (not seen in the wild-type embryo). 1st, first branchial arch.