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Effect of antioxidants on MG132-induced clonogenic cell kill. Clonogenic assay of (A) SK-N-BE(2c) and (B) UVW/NAT cells exposed to MG132 for 24 h in the presence or absence of NAC (1 mM) or tiron (1 mM). Data are means ± SEM, n = 4; significance of differences: * p < 0.05, ** p < 0.01 from untreated control.
