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Representative gelatin zymogram showing gelatinase levels in the injured spinal cord at 7 d postinjury. Both MMP-9 and MMP-2 are upregulated in the wild-type mouse compared with the sham-operated mouse that receives only laminectomy. The intensity of both pro- and active MMP-2 in the wild-type mouse is comparable with that of the MMP-9 null mouse, suggesting the expression of MMP-2 is unaltered in the later.
