Proc Natl Acad Sci U S A. 1984 Oct;81(19):6183-7. doi: 10.1073/pnas.81.19.6183.
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Activation of rat liver adenylate cyclase by guanosine 5'-[beta,gamma-imido]triphosphate and glucagon. Existence of reversibly and irreversibly activated states of the stimulatory GTP-binding protein.