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PMRP improved the histological structure of the aged rat skins. The total thickness of the skin (a) and the level of HYP, collagen I, and collagen III (b) of the aged rat skins were determined among different groups. The means ± SD of three independent samples are shown. The expression levels among the different groups were determined by one-way ANOVA. The difference is significantly different (p < 0.05) where the letters over the bars are different.
