Figure 6From: Alterations of matrix metalloproteinases in the healthy elderly with increased risk of prodromal Alzheimer's diseaseError plot of difference in MMP-9 levels between cognitively healthy elderly individuals with at least one APOE ε4 allele (n = 9) compared with those without the allele (n = 25). CSF MMP-9 levels are presented in ng/ml. CSF, cerebrospinal fluid; MMP, matrix metalloproteinase.Back to article page