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The modulating effect of Lupeol [lup-20(29)-en-3 β -ol], a triterpene found in many fruits and medicinal plants, on benzoyl peroxide-induced tumor promotion responses or tumor promotion in murine skin is described. Benzoyl peroxide is an effective cutaneous tumor promoter acting through the generation of oxidative stress, the induction of ornithine decarboxylase activity and the enhancement of DNA...