_:b662817239 . _:b662817239 . _:b662817239 . _:b662817239 "Orthology that involves two genes when duplications more recent than the species split have occurred in one species but not the other." . _:b662817239 . _:b662817239 . _:b662817239 . _:b662817239 . _:b662817239 .