The action of the initiating agent in epidermal carcinogenesis.
D000818:Animals; D001551:Benz(a)Anthracenes; D002273:Carcinogens / Q000494:pharmacology*; D003436:Croton Oil; D051379:Mice; D009374:Neoplasms, Experimental; D010212:Papilloma / Q000139:chemically induced*; D012878:Skin Neoplasms / Q000139:chemically induced*
D001551:Benz(a)Anthracenes; D002273:Carcinogens; D003436:Croton Oil