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Cells were pretreated with NAC (20 mM), cultured for 1 hr and incubated in the presence of varying concentrations of Cr(VI) for 24 hrs. Cell viability was determined by MTT assays. The data are the mean ± SD values of triplicate measurements from a representative of three independent experiments. (*Significant versus Control group; p<0.05; #Significant versus Cr(VI)-treated Group; p<0.05).
