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In reptiles, the atrioventricular valve complex is dominated by large medial leaflets (B), albeit lateral cushions can be found (arrows, in B–C). 12 µm section of the adult heart of a green anole stained with picro-sirius red (collagen red, myocardium orange), a, atria; as, atrial septum; la, left atrium; lav, left atrioventricular valve leaflet; ra, right atrium; rav, right atrioventricular valve leaflet; ven, ventricle.
