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(a) Cell viability (%) of S4 in human skin fibroblasts. (b) Effect of S4 on intracellular oxidative stress in ultraviolet (UV)B-induced human skin fibroblasts. The results were given as mean ± standard deviation (n = 3). Significant difference versus non-irradiation group: ###, p < 0.001. Significant difference versus non-treatment group: **, p < 0.01.
