egf binding was inhibited by low concentrations of the tumor promoters 12-o-tetradecanoyl phorbol-13-acetate ( tpa ) and phorbol didecanoate ( pdd ) , but not by the non-promoting phorbol esters 4-o-methyl tpa and 4 alpha-pdd .
C0039654
12-o-tetradecanoyl phorbol-13-acetate
C0031586
phorbol esters