HyperglycemiaDiabetes Mellitus, ExperimentalBlood GlucoseInsulinGlucoseDiabetes Mellitus, Type 2Hypoglycemic AgentsStreptozocinGlucose Tolerance TestDiabetes MellitusDiabetes Mellitus, Type 1HypoglycemiaIslets of LangerhansHyperinsulinismInsulin ResistanceGlucagonInsulin-Secreting CellsHemoglobin A, GlycosylatedFastingPostprandial Period