under voltage-clamp conditions , although the phorbol ester tpa per se never elicited any changes in ionic conductance , chloride current responses of mrna-injected cells to 5-hydroxytryptamine and acetylcholine ( ach ) were suppressed by an 8-min pretreatment of 12-o-tetradecanoyl-4 beta-phorbol-13-acetate ( tpa ) , at nanomolar concentrations .
C0031586
phorbol ester
C0039654
12-o-tetradecanoyl