as long as the adult type of epidermal differentiation is not sufficiently developed ( i.e. , prior to postnatal day 5 ) , topical application of the phorbol ester tumor promoter 12-o-tetradecanoyl-phorbol-13-acetate ( tpa ) causes neither morphological alterations nor a measurable induction of cellular proliferation and ornithine decarboxylase activity .
C0031586
phorbol ester
C0039654
phorbol