recent studies suggest that 12-o-tetradecanoylphorbol 13-acetate ( tpa ) , one of a family of phorbol esters that are known tumor promoters , can activate intracellular ca2+ , phospholipid-dependent protein kinase ( protein kinase c ) directly .
C0039654
12-o-tetradecanoylphorbol 13-acetate
C0031586
phorbol esters