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Metabolic activity of the cells (red/green ratio) was estimated with FUN-1 stain. Data are expressed as ratio of red (λ = 575 nm) to green (λ = 535 nm) fluorescence and presented as mean ± SD from three independent experiments. Bars indicate SD. Statistical significance was assessed using ANOVA and the Dunnett’s post hoc test (* p < 0.05; ** p < 0.01, *** p < 0.001) compared to the control (untreated).
