Receptors, GlucagonGlucagonOxyntomodulinReceptors, Gastrointestinal HormoneGlucagon-Secreting CellsLiverAdenylate CyclaseGlycogenolysisInsulinGlucagon-Like PeptidesGlucagon-Like Peptide 1GTP-Binding Protein alpha Subunits, GsBlood GlucoseGlucoseCyclic AMPCell MembraneReceptors, Cell SurfaceGuanylyl ImidodiphosphateBinding, CompetitiveHepatocytesRats, Inbred StrainsKineticsSomatostatinIslets of LangerhansGuanosine TriphosphateProglucagonHypoglycemiaMolecular Sequence DataGluconeogenesisGlucose Tolerance TestArrestinsAmino Acid SequencePeptidesCricetinaePancreatic HormonesEnzyme ActivationPancreatic PolypeptidePancreasTransfectionEpinephrineCells, Cultured