Figure 2.Senescence identification of BMSCs in aged and young rats. (A) 53BP1 immunofluorescence staining of aged and young rat BMSCs; (B) H3K9Me3 immunofluorescence staining of aged and young rat BMSCs; (C) Senescence marker protein assay and relative protein expression statistics of aged and young rat BMSCs ; (D) β-Galactosidase staining plots and statistical plots of the percentage of positive β-galactosidase staining cells ; *P < 0.05 vs. young female rats, **P < 0.01 vs. young female rats, #P < 0.05 vs. young male rats, ##P < 0.01 vs. young male rats.