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Zymographic analysis of MMP-9 activity in injured spinal cord extracts. Up-regulation of MMP-9 is observed at 6, 24, 48, and 72 h after injury, and reached a maximum level at 24 h after the insult (mean±SEM, n=5 per time point). *p<0.05 compared with the control group; the Mann-Whitney U test. MMP : matrix metalloproteinases, SEM : standard error of the mean.
