using a collagen film assay utilizing 14c-labeled type i collagen , we demonstrated that cultured human keratinocytes produced a procollagenase after treatment with the tumor-promoting phorbol ester , 12-o-tetradecanoylphorbol-13-acetate ( tpa ) .
C0031586
phorbol ester
C0039654
12-o-tetradecanoylphorbol-13-acetate