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Fig. 5. Rarb-null embryos are resistant to BMS453-induced teratogenic effects. External views (A,B) and frontal histological sections (C,D) of the branchial arches of Rarb-null embryos after 48 hours in culture either without retinoid (vehicle) or in the presence of BMS453. A1-A3 and B1-B3, aortic arches and branchial arches 1 to 3, respectively; P1, first pharyngeal pouch. Scale bar in D: 200 µm for C,D.