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Effect of increasing concentrations of S. nigra extract and ferment (100, 250 and 1000 μg/mL) on neutral red uptake in cultured keratinocytes and fibroblasts after 24 h of exposure. Data are the mean ± SD of three independent experiments, each consisting of three replicates per treatment group **** p < 0.0001, *** p < 0.001, ** p < 0.01 compared to the control.
