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The anti-photoaging activity of PME. (a) Elastase inhibition activity of PME. (b) The effect of PME on UVB-induced cell viability in HaCaT cells. (c) The effect of PME on the content of MMP-1 in HaCaT cells. (d) The effect of PME on the content of MMP-3 in HaCaT cells. Different lowercase letters indicate significant differences at p < 0.05. Data are presented as the mean ± SD of three independent experiments.
