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Effects of catechu extracts on (A) WS1 and (B) HaCaT proliferation. Increased cell proliferation was observed after treatment with catechu extracts for 24 h. Data are presented as means ± SD in three independent experiments. The p-value was calculated versus the control. Using the one-tailed test analysis, * indicates p < 0.05 and ** indicates p < 0.005 between different catechu concentrations.
