phorbol ester , phorbol 12-myristate 13-acetate ( pma ) , induced a 20- to 50-fold increase ( ed50 : 2 microm ) in cyclic adenosine 3 ' , 5'-monophosphate ( camp ) levels in spermatozoa incubated in capacitation medium for short periods of time ( 30 min ) .
C0031586
phorbol ester
C0039654
phorbol