when 1321n1 cells were treated with phorbol ester ( 100 nm 4 beta-phorbol 12 beta-myristate 13 alpha-acetate ( pma ) ) prior to preparation of the membranes , the maximal [ 3h ] insp formation induced by gtp gamma s or gtp gamma s plus carbachol was decreased by 50-75 % .
C0031586
phorbol ester
C0039654
pma