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Caption2 = [[Laparoscopic]] view of a horse's spleen (the purple and grey mottled organ) | Precursor = [[Mesenchyme]] of [[dorsal mesogastrium]] |

...[[heart]]. It is normally tricuspid (with three leaflets), although in 1% of the population it is found to be congenitally bicuspid (two leaflets).<ref> ...e. The closure of the aortic valve contributes the A₂ component of the second [[heart sound]] (S₂).