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Cytotoxic effect of PSs. Vero cells (2x105) were plated in 24 well plates and treated with different concentrations of the tested PSs. The cell viability was measured 3 days after the treatment. The results are presented as a percentage of the control untreated cells. Data are expressed as the mean ± SEM percentage (n = 5); *p < 0.05; **p < 0.001 vs. control untreated cells.
