Different expression patterns of p53 mRNA and protein between chalk and basalt mole rat populations. (A) Comparing p53 mRNA in lung, liver, kidney, brain, and spleen between chalk and basalt mole rat populations. (B) Western blot showing tissue-specific expression of p53, p21, and mdm2 proteins in lung, liver, and kidney compared between chalk and basalt mole rat populations. Results are mean ± SEM (n = 6). *P < 0.05 (unpaired t test).