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M-1 to M-2 microglial ratio in the ipsilateral cortex. M-1/M-2 ratio lower than 1 favored anti-inflammation, as observed in in sham group and in both SC and RC groups at 6 h. M-1/M-2 ratio >1 supported inflammatory environment, evident in RC group 72 h group. One-way ANOVA with Tukey's post-hoc test.*p < 0.05 compared to single hit 6 h. @p < 0.05 compared to repeated hit. SC: single concussion, RC: repeated concussion.
