the carotenoids beta-carotene ( c ) and canthaxanthine ( cx ) , with and without pro-vitamin a activity , respectively , when perorally administered to mice , markedly prevent benzo ( a ) pyrene photocarcinogenic enhancement ( bp-pce ) , continue to block such bp-pce and protect significantly against bp carcinogenesis in mice maintained in the dark .
C0007271
carotenoids
C0053396
beta-carotene