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Reactive oxygen species (ROS) determination, performed by using a fluorescent probe 2′,7′-dichlorofluorescein diacetate (DCFH-DA), in DU-145 cells untreated and treated with different concentrations of the essential oils from Sa, Sj and Sv for 72 h. The values are the mean ± standard deviation (SD) of three experiments performed in quadruplicate. *Significant vs. control untreated cells (p < 0.001).
