Figure 1From: Increased expression of matrix metalloproteinase-10, nerve growth factor and substance P in the painful degenerate intervertebral discExpression of matrix metalloproteinase-10 in postmortem (PM) normal, PM degenerate and surgical degenerate human intervertebral disc. Relative gene expression was normalised to the housekeeping gene glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and plotted on a log scale. **P < 0.01.Back to article page