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Inhibition of cell viability following CPT or CN-CPT treatments. CAL-62 (A, B) or BHT-101 (C,D) cells (1 × 103/well) were treated with the indicated concentrations of drug for 24–48 h. Results are expressed as % of viability inhibition of control and shown as mean ± SEM (n = 5). *p < 0.05, **p < 0.01 significantly different from the same concentration of CPT.
