furthermore , evidence for an additional mechanism of action was obtained from experiments with 12-o-tetradecanoylphorbol-13-acetate ( tpa ) , a phorbol ester which stimulates insulin secretion by at least two mechanisms , one ca2+ dependent and one ca2+ independent .
C0039654
12-o-tetradecanoylphorbol-13-acetate
C0031586
phorbol ester