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Effect of metformin on the apoptotic rate of A172 glioma cells. (A) Control group, (B) metformin 0.1 mmol/l. (C) metformin 1 mmol/l and (D) metformin 10 mmol/l. Q2 advanced apoptotic cells and Q4 early apoptotic cells. PI, propidium iodide; FITC, fluorescein isothiocyanate.
