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Fig. 2. Frontal histological sections at comparable levels of the hindbrain (A,B) and of the midgut (C,D) of wild type (A,C) and A{alpha}/A{gamma} mutants (B,D) at E9.5. B3, branchial arch 3; H, heart; MG, midgut; O orthotopic otocyst; O*, ectopic otocyst; P, pharynx; R, rhombencephalon; U, umbilical vein. The arrow points to the persistent opening of the gut. Scale bar: 35 µm (A,B); 60 µm (C,D).