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Effects of PA on MMP-1 (A) and PIP (B) expression in UVA-irradiated HDF cells. The expression levels of MMP-1 and PIP were measured by use of commercial ELISA kits, following the manufacturer’s instructions. The values are expressed as the mean ± SD in triplicate experiments. ## p < 0.01 indicates a significant difference compared to the control group and * p < 0.05 and ** p < 0.01 indicate a significant difference compared to the only UVA-irradiated groups.
