_:b663965014 . _:b663965014 . _:b663965014 . _:b663965014 . _:b663965014 . _:b663965014 . _:b663965014 "Orthology that involves two genes when duplications more recent than the species split have occurred in one species but not the other." . _:b663965014 . _:b663965014 .