phorbol 12-myristate 13-acetate ( pma ; 0.03 , 0.1 and 1.0 mumol/l ) , a protein kinase c activating phorbol ester , significantly enhanced the stimulation-induced ( s-i ) outflow of radioactivity at 5 hz stimulation in mouse atria preincubated with [ 3h ] -noradrenaline , whereas a phorbol ester which does not activate protein kinase c , phorbol 13-acetate ( 0.1 mumol/l ) , had no effect .
C0039654
pma
C0031586
phorbol ester