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Effect of N-acetylcysteine (NAC) on Cd-induced cytotoxicity in hepatocytes. Cells were incubated with NAC (1 or 2 mM) and Cd (2.5, 5, or 10 µM) simultaneously for 24 h. An MTT assay was then performed to evaluate cytotoxicity. Each experiment was repeated six times and data are expressed as the mean ± SD (**p < 0.01, #p < 0.05, and ##p < 0.01 compared to cells treated with Cd alone).
