when human epidermoid carcinoma a431 cells labeled with 32pi to steady state specific activity were treated either with epidermal growth factor ( egf ) or with active phorbol ester tumor promoters such as 12-o-tetradecanoylphorbol 13-acetate ( tpa ) or phorbol 12,13-dibutyrate , labeling of 160 kda egf receptors isolated by immunoprecipitation with monoclonal anti-egf receptor igg was increased 2- to 3-fold .
C0031586
phorbol ester
C0039654
12-o-tetradecanoylphorbol