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Fig. 1. Effects of the panRAR-selective agonist TTNPB on branchial arch development. Morphology of vehicle-treated (A) and TTNPB-treated (B) wild-type embryos after 48 hours in culture. B1-B3, branchial arches 1 to 3, respectively; B1-2, fused first and second branchial arches; H, heart; O, otocyst. Arrowhead indicates the first branchial cleft.