Fig. 4. Effects of different muscle activity levels 2 and 3 days after glycerol muscle injury. A) PDGFRα protein levels from TAg of each experimental group (CTL, EX and HU), 2 and 3 days after glycerol muscle injury (N=6). B) Representative PDGFRα immunostained histological transversal paraffin-embedded from TAg of each experimental group (CTL, EX and HU), 2 and 3 days after glycerol muscle injury (N=4). C) TNFα protein and TGF-β1 mRNA levels from TAg of each experimental group (CTL, EX and HU), 2 and 3 days after glycerol muscle injury (N=6). D) C/EBPβ protein levels from TAg of each experimental group (CTL, EX and HU), 2 and 3 days after glycerol muscle injury (N=6). Two-way ANOVA was used to compare our experimental groups, * p<0.05, **p<0.01 and *** p<0.001 vs the TAg-CTL group at the same time after glycerol injury (effects of muscle activity variations). # p<0.05, ## p<0.01 and ### p<0.001 vs the same group at 2 days after injury (time effect).