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Cell proliferation assay. HaCaT cells were treated with increasing concentrations (0.1 to 10 μg/mL) of different extract (as indicated) or DMSO (Ctrl). The SRB absorbance at 540 nm was recorded 6, 24, 48, and 72 h after treatment. Data are expressed as mean ± SD of three independent experiments and normalized to the Ctrl value. One-way ANOVA was used for determining the statistical differences between groups.
