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Detection of metformin-induced downregulation of p21 by immunocytochemistry. HEK293 cells were grown on glass slides until 60% confluence. The cells were cultured with 5.5 mM or 25 mM (HG) D-glucose for three days. For the last 24 h, 8 mM metformin (Met) was added to the indicated conditions. Original magnification ×400. Representative image of two independent experiments.
