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Objective In order to understand which kind of function genes play an important role for es-timating wound age, the variation of difference genes’ mRNA expression were compared after injury. Methods T he mRNA expression levels of seven candidate genes (ICAM-1, NF-κB, MX2, MT1, MT2, sTnI, and Cox6c) were analyzed in contused rat skeletal muscle at different time points using real-time fluorescent quantitative PC R (R T-qPC R ). T he rawC t values were normalized relative to that of RPL32 mRNA , and converted to standard C t values. A t each time point after injury, the standard deviations (SD ) of the standard C t values were calculated by SPSS. Results T he expression trends of the seven genes were all found to be related to wound age, but there were lower variation coefficients and greater reliability of sTnI and Cox6c when compared with other genes. Conclusion T he genes encoding struc-tural proteins or proteins that performbasic functions can be suitable for wound age estimation.