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The concentration of interleukin-6 (IL-6; y-axis, picograms/milliliter) measured in the epidural space overlying the L5 DRG at baseline (Time=0hr) and 3, 6 and 24 hr after the application of saline (N = 15), autologous nucleus pulposus (NP=15) or NP + a neutralizing antibody to interferon-gamma (anti-IFNγ; N=18). ## p<0.005 at T=3hr and T=6hr compared to T=0hr; ** p<0.001 between-groups difference between NP and saline groups.
