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Later steps in cardiac morphogenesis. Shown are ventricular septation, atrial septation, and septation of the outflow tracts. ao, aorta; as 1°, primum atrial septum; as 2°, secundum atrial septum, cc, cardiac cushions; ot, outflow tract; pa, pulmonary artery; vs, ventricular septum. Days of development for mouse and human are shown below. (From Bruneau 2008, with permission.)
