consistent with a protein kinase c activity in sarcolemmal vesicles , the tumor-promoting phorbol ester 12-o-tetradecanoylphorbol 13-acetate stimulated 15-kda protein phosphorylation severalfold , producing approximately 70 % of the maximal phosphorylation even in the absence of significant ionized ca2+ .
C0031586
phorbol ester
C0039654
12-o-tetradecanoylphorbol 13-acetate