Inhibition of UVA-induced ROS formation by AVS073 (A) and GA (B). Oxidant formation was assessed by measurement of fluorescence of the DCF. Values are expressed as mean±SEM. The statistical significance of differences between the control and UVA-irradiated cells was determined by Student’s t test and between UVA-irradiated and AVS073 extracts- or GA-treated cells by one-way ANOVA followed by Tukey’s post hoc test. *p < 0.05; **p < 0.01; ***p < 0.001 compared with AVS073- or GA-treated cells without UV irradiation.