VEGFA and type 1 diabetes mellitus: In T1DM rats, neovascularization in subcutaneous inserted Matrigel with pre‐added VEGF indicated pathological angiogenesis with incomplete/abnormal neovascular endothelial structure, while treatment with intravenous Ang‐1 adenovirus increased functional vascular tube like structures with intact endothelial and tight junction structure, and reduced inflammatory cell infiltration.66