the activity of dietary and topical administration of three retinoids , all-trans-retinoic acid , 13-cis-retinoic acid , and n- ( 4-hydroxyphenyl ) retinamide ( 4-hpr ) , as promoters of skin tumor induction in sencar mice was studied .
C0035339
retinoids
C0040845
all-trans-retinoic acid