the phosphorylation required calcium ( ka approximately 1.0 microm ) and was stimulated by tumor-promoting phorbol ester ( 12-o-tetradecanoylphorbol 13-acetate ) in the presence of a low concentration of calcium ( 0.1 microm ) .
C0031586
phorbol ester
C0039654
12-o-tetradecanoylphorbol