the phorbol ester tumor promotor 12-0-tetradecanoylphorbol-13-acetate ( tpa ) specifically inhibited the binding of radioiodinated epidermal growth factor ( 125i-egf ) to rat pheochromocytoma ( pc12 ) cells in a noncompetitive fashion with an apparent ki of 11-26 nm .
C0031586
phorbol ester
C0039654
tetradecanoylphorbol