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(A) Gelatin zymography shows greater matrix metalloproteinase (MMP)-9 levels compared to proMMP-9 and MMP-2 levels in the parietal cortex. (B) Box plots show significantly increased MMP-9 but not proMMP-9 or MMP-2 activity in parietal cortex in mild cognitive impairment (MCI) and Alzheimer disease (AD) compared to the no cognitive impairment (NCI) group (p = 0.0094). Relative units in the Y-axis are described in Materials and Methods
