the specific activity of protein kinase c in rat skeletal myoblasts decreased when they were exposed for very short periods to isoproterenol , forskolin , dibutyryl cyclic amp ( bt2camp ) , or the phorbol ester , 12-o-tetradecanoylphorbol-13-acetate ( tpa ) .
C0031586
phorbol ester
C0039654
12-o-tetradecanoylphorbol-13-acetate