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Effect of Tnfa deficiency on Ngf expression in vivo. Expression of Ngf 1, 3, and 7 days after IVD injury in wild-type (C57BL/6 J) and Tnfa-KO mice (n = 10 for each time point). Values represent mean ± standard error. *P < 0.05 compared to wild-type at the same time point. Relative Ngf expression was calculated based on Ngf expression in wild-type mice at each time point
