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Effect of omija (Schisandra chinensis (Turcz.) Baill.) essential oil on the production of ROS in UV-B irradiation-induced HaCaT keratinocytes. Values are expressed as the mean ± standard deviation. Different letters (a–e) among samples indicate significant differences by one-way ANOVA followed by Duncan’s post hoc test (p < 0.05). control: group without UV-B irradiation.
