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a: Cytotoxic effects of cisplatin at concentrations of 60, 120,180, 240, 300, 360 and 420 µg/ml on MCF-7 cells versus control group (P<0.001). b: Cytotoxic effects of cisplatin at various concentrations of 5060, 120,180, 240, 300, 360 and 420 µg/ml on MCF-7 cells comparing to the control group following incubation for different time lengths (P<0.001)
