Receptors, GlucagonGlucagonOxyntomodulinReceptors, Gastrointestinal HormoneGlucagon-Secreting CellsLiverAdenylate CyclaseGlycogenolysisInsulinGlucagon-Like PeptidesGlucagon-Like Peptide 1GTP-Binding Protein alpha Subunits, GsBlood GlucoseGlucoseCyclic AMPCell MembraneReceptors, Cell SurfaceAmino AcidsBinding, CompetitiveKineticsGuanylyl ImidodiphosphateSequence Homology, Amino AcidHepatocytesRats, Inbred StrainsMolecular Sequence DataSomatostatinIslets of LangerhansGuanosine TriphosphateAmino Acid SequencePeptidesProglucagonHypoglycemiaGluconeogenesisCricetinaeGlucose Tolerance TestArrestinsTransfectionEnzyme ActivationCell LinePeptide FragmentsPancreatic HormonesPancreasPancreatic PolypeptideCells, CulturedRNA, MessengerEpinephrineCHO CellsMice, Inbred C57BLRats, Sprague-Dawley