stimulation of rat lung and liver adenylate cyclase activities with 1-isoproterenol was potentiated by either gtp4 or gmp.pnp , thus indicating that gtp4 resembles other guanine nucleotides in their capacity to increase the sensitivity of adenylate cyclase to beta-adrenergic agonists .
C0018352
gtp4
C0018328
guanine nucleotides