A. Permeability assay using vibratome section showing the cadaverine 555 dye (red), CD31 (green) and CD13 (purple) in the brain vasculature of Glut1iECKO mice with (bottom) or without (top) lactate administration. Note the extravascular accumulation of cadaverine dye in control Glut1iECKO mice, but not in lactate supplemented Glut1iECKO mice. 