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Fig. 6. Transverse sections through P4 hearts of Cx43+/+ (A), Cx43+/31 (B) and Cx4331/31 mice (C). The heart of the Cx4331/31 mouse showed irregular hypertrophic trabeculae with abnormal pouches (asterisks) in the subpulmonary outlet of the right ventricle. The heart of the Cx43+/31 mouse was almost normal. aa: ascending aorta; la, left atrium; ra, right atrium; rv, right ventricle; pv, pulmonary valve. Bar, 500 µm.