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Effect of hypoxic duration on cell viability. Cell viability was measured by 3-(4,5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) assay. Data presented are the mean ±SD of three independent experiments. * P<0.05; ** P<0.01; *** P<0.001. The significance marked at the top of the columns refers to comparison with the C group.
