Receptors, GlucagonGlucagonOxyntomodulinGlucagon-Secreting CellsReceptors, Gastrointestinal HormoneLiverAdenylate CyclaseGlucagon-Like Peptide 1GlycogenolysisBlood GlucoseInsulinGlucagon-Like PeptidesGTP-Binding Protein alpha Subunits, GsGlucoseCyclic AMPCell MembraneReceptors, Cell SurfaceGuanylyl ImidodiphosphateBinding, CompetitiveHepatocytesRats, Inbred StrainsKineticsSomatostatinMice, Inbred C57BLIslets of LangerhansGuanosine TriphosphateProglucagonHypoglycemiaMolecular Sequence DataGluconeogenesisGlucose Tolerance TestArrestinsAmino Acid SequencePeptidesCricetinaePancreatic HormonesEnzyme ActivationPancreatic PolypeptidePancreasTransfection