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Changes of proteins in the MAPK pathway. (A) Western blot (WB) detected the expression levels of BRAF, MEK, and ERK. The original WB images were available in the supplementary file. (B, C) BRAF protein expression in young and old mice. (D, E) MEK protein expression in young and old mice. (F, G) ERK protein expression in young and old mice. (***) P < 0.05.
