in the presence of 3-isobutyl-1-methylxanthine , both glucose and the phorbol ester 12-o-tetradecanoylphorbol 13-acetate ( tpa ) , an activator of protein kinase c , enhanced cyclic amp formation 2.5-fold during 60 min of incubation .
C0031586
phorbol ester
C0039654
12-o-tetradecanoylphorbol 13-acetate