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Effects of treatments on expression levels of matrix metalloproteinase 1 (MMP1) in a mouse model of photoaging. Concentrated growth factor treatment decreased the expression levels of MMP1. (a) Hematoxylin and eosin staining (×400); (b) MMP1-positivity rate. P values compared with NC group.
NC, normal control; CGF, concentrated growth factor; PSR, plasma skin regeneration system irradiation.
