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UVB irradiation damages HDF cells and HFPS promotes HDF cell proliferation: (A) cytotoxicity of UVB irradiation on HDF cells; and (B) proliferation effect of HFPS on HDF cells. Cell viability was measured by 3-(4-5-dimethyl-2yl)-2-5-diphenyltetrazolium bromide (MTT) assay. The data are expressed as the means ± SE (n = 3), * p < 0.05, ** p < 0.01 as compared to control group.
