in plasma membranes from control cells in the presence of heat-inactivated human erythrocyte membranes both guanosine 5'- [ beta , gamma-imido ] triphosphate ( p [ nh ] ppg ) plus lutropin and naf caused a 45 -- 50-fold increase in cyclic amp production over 30 min compared with 12 -- 13 fold p [ nh [ ppg and 2 -- 3-fold with lutropin alone .
C0007603
plasma
C0007634
cells