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Effect(s) of metformin on the viability of normal cells. (A) Normal human colon CCD 841 CoN cells, (B) embryonic lung HEL 299 cells and (C) 293 cells were treated with 0, 10, 20, 30 and 50 mM of metformin for 48 h. The cell viability was determined via the MTT assay. The values are presented as the mean ± standard deviation of triplicates within three representative experiments.
