SomatostatinGlucagonPancreasReceptors, SomatostatinInsulinReceptor, InsulinReceptors, GlucagonOctreotideGlucoseIslets of LangerhansInsulin ResistanceGlucagon-Secreting CellsSomatostatin-28Blood GlucoseLiverInsulin Receptor Substrate ProteinsHypoglycemic AgentsInsulin AntagonistsSecretory RateInsulin, Long-ActingGlucose Tolerance TestInsulin AntibodiesPancreatic HormonesHypoglycemiaInsulin-Secreting CellsGastrinsC-PeptideGlucose Clamp TechniqueRats, Inbred StrainsPancreatic PolypeptideCells, CulturedGrowth HormoneDiabetes Mellitus, Type 2FastingSomatostatin-Secreting CellsHormones