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GLUT1, the most ubiquitously expressed member of the GLUT family of glucose transporters, can be acutely activated by a variety of cell stresses. Methylene blue activates glucose transport activity of GLUT1 in L929 fibroblast cells presumably by a redox cycling of MB, which generates an oxidative stress. Data shown here reveal that methyl-β-cyclodextrin (MCD) blocks both the staining of cells and...