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Time course of cathepsin S (CatS) mRNA expression in the ipsilateral cortex of mice after traumatic brain injury (TBI). The level of CatS mRNA was significantly increased at 3 h after TBI as compared with that in the sham group. β-actin was used as an internal control. The data were normalized to β-actin expression and were expressed as fold increase of the sham group. Data represent mean ± SEM (n = 6). *P < 0.05 versus sham group.
