_:b1218776 . _:b1218780 . _:b1218780 . _:b1218779 _:b1218778 . _:b1218778 _:b1218777 . _:b1218779 . _:b1218777 . _:b1218780 . _:b1218777 . _:b1218776 . "integumental system environment" . _:b1218778 . . _:b1218776 _:b1218779 . . _:b1218777 . _:b1218780 .