both the alpha 2-adrenergic and the muscarinic inhibitions were prevented by pretreatment of the cells with pertussis toxin , and were unaffected by the phorbol ester 12-o-tetradecanoylphorbol 13-acetate .
C0031586
phorbol ester
C0039654
12-o-tetradecanoylphorbol 13-acetate