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MAPK signaling during heart development. Proposed MAPK signaling events during various stages of heart development. FHF, first heart field; SHF, second heart field; CNC, cardiac neural crest; V, ventricle; A, atria; RA, right atrium; LA, left atrium; CT, conotruncus; RV, right ventricle; LV, left ventricle; AVV, atrioventricular valves; Ao, aorta; PA, pulmonary artery; DA, ductus arteriosus. [Modified from Srivastava (379).]
