_:b665803418 . _:b665803418 . _:b665803418 . _:b665803418 . _:b665803418 . _:b665803418 . _:b665803418 "Orthology that involves two genes when duplications more recent than the species split have occurred in one species but not the other." . _:b665803418 . _:b665803418 .