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Fig. 10. Synergistic effects of the RARß agonist BMS453 and of the panRXR-selective agonist BMS649. Frontal histological sections are from comparable levels of wild-type embryos after 48 hours in culture. A1-A3, aortic arches 1 to 3, respectively; A1-A2 fused first and second aortic arches; P1, first pharyngeal pouch. Arrowhead indicates the first branchial cleft. Scale bar in A: 200 µm for A-C.