To further explore the molecular mechanism for the reversion of diabetes and β-cell recovery/regeneration in diabetic mice treated with hBMSCs-VEGF, pancreatic islets from control healthy mice, STZ-induced diabetic mice, and diabetic mice rescued by hBMSCs-VEGF were examined by high resolution confocal microscopy imaging system to assess Insulin/IGF receptor/PI3-K downstream proteins. The gene discussed is VEGFA; the disease is diabetes mellitus.