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Expression of candidate genes related to senescence. (A) The mRNA expression of senescence-related genes. (B) Western blotting analysis for candidate genes related to senescence and protein level quantification. The data are presented as the mean ± SEM (n = 3). Compared with the 22PDL or 49PDL group, * p < 0.05, ** p < 0.01, or *** p < 0.001.
