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Cell viability in HFF-1 and NCTC 2544 cells untreated (Ctr) or treated for 4 h with C. sinensis extract at different concentrations (0.5–5–50–100 μg/mL) and irradiated with 25 mJ/cm2 (A,C) and 50 mJ/cm2 of UVB (B,D). Values are the mean ± S.D. of five experiments in triplicate. * Significant vs. untreated control cells: p < 0.001; ** Significant vs. untreated irradiated cells: p < 0.001.
