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Effects of colistin and nisin on Vero cell cultures. (A) Vero cells cultured in the presence of colistin. (B) Vero cells cultured in the presence of nisin. (C) Vero cells exposed to colistin at 1 mg/ml mixed with nisin at various concentrations. (D and E) Vero cells cultured in the absence or presence of colistin at 1 mg/ml, respectively (magnification, ×48).
