_:b665859496 . _:b665859496 . _:b665859496 . _:b665859496 . _:b665859496 . _:b665859496 . _:b665859496 . _:b665859496 "Orthology that involves two genes when duplications more recent than the species split have occurred in one species but not the other." . _:b665859496 .