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Evaluation of in vitro cytotoxicity of SD-stabilized zein nanoparticles containing PTX (prepared using 0.3 mg/ml of active compound) on MCF-7 and K562 cells as a function of the drug concentration and incubation time. Data are the percentages of cellular viability as evaluated by MTT-testing. Results are the mean of four different experiments ± standard deviation. *p < 0.05, **p < 0.001 (with respect to the untreated cells).
