Figure 3From: Increased expression of matrix metalloproteinase-10, nerve growth factor and substance P in the painful degenerate intervertebral discHistogram illustrating the percentage of matrix metalloproteinase-10 immunopositive cells in postmortem (PM) normal, PM degenerate and surgical degenerate nucleus pulposus samples classified according to histological grade of degeneration. Values are mean ± standard error of the mean. *P < 0.05.Back to article page