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Cytotoxicity assay of oleuropein. HeLa cells were treated with different concentrations of oleuropein (25 µg/mL, 50 µg/mL, 100 µg/mL, 150 µg/mL, 200 µg/mL, 300 µg/mL, and 400 µg/mL). The cells were collected 72 h post-treatment, and the cell viability assay was carried out as described in the Section 2 and graphically reported as viability (%). The assay results are presented as the means of triplicates ± SD.
