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Cell Proliferation at 2 and 4 weeks following trauma. Ki-67 was used to visualize the proliferating cells. Both groups had more proliferating cells at 2 weeks than at 4 weeks. NgR1 knockout (KO) mice (B) had more Ki-67+ cells than did wild type (WT) mice (A) at 2 weeks post-trauma (p=0.011). At post-trauma week 4, no difference between KO (D) and WT (C) mice was observed (E) (p=0.746). (Data presented as mean±SEM).
