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Effect of DCEQA on the secretion levels of MMP-1, MMP-2, MMP-9, and type Iα1 procollagen. Cells were treated with DCEQA at the indicated concentrations for 24 h following UVB irradiation (15 mJ/cm2). Released protein amounts from conditioned HaCaT cell culture medium were quantified by an ELISA kit. Values are mean ± SD of three independent experiments run in triplicate. a-eMeans with different letters are significantly different at p < 0.05 level.
