The relationship of (A) myelin-associated glycoprotein (MAG), (B) myelin-basic protein (MBP), (C) proteolipid protein (PLP), and (D) the MAG/PLP ratio to parietal cortical amyloid-β (Aβ) plaque load in the Alzheimer's disease (AD) cohort. Levels of MAG were significantly negatively correlated with Aβ load (r=−0.318, P=0.0429) whereas MBP, PLP, and the MAG/PLP ratio were not significantly altered. The solid lines represent the best-fit linear regression lines, and the dashed lines the 95% confidence intervals. AU, arbitrary unit.