the phorbol esters , phorbol 12,13-dibutyrate and 12-o-tetradecanoyl-phorbol-13-acetate , prolonged calcium-dependent action potential duration at resting membrane potential and at more negative membrane potentials but decreased action potential duration following membrane depolarization to less than -45 mv .
C0031586
phorbol esters
C0039654
12-o-tetradecanoyl-phorbol-13-acetate