however , the phorbol ester , 12-o-tetradecanoylphorbol 13-acetate ( tpa ) , had no demonstrable effect on catecholamine release , arguing against a significant role for protein kinase c in secretion from adrenal chromaffin cells .
C0031586
phorbol ester
C0039654
12-o-tetradecanoylphorbol 13-acetate