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Percentage of cell viability after 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay. Cells were treated with different doses (800–100 µg/mL) of Origanum vulgare EO for 24 h and solvent (DMSO, 0.1%) alone. Data are the mean ± SD of three experiments **** - p < 0.0001.
