Correlation of [3H]PBR28 binding with Aβ immunohistochemical staining. Data from piriform cortex (left column), motor cortex (middle column) and striatum (right column) from APP/PS1 and wt mice. The correlation lines were fitted by linear regression; R2 ~ 0.66,0.87,0.71, from left to right. The slopes of the fitted lines are significantly non-zero; p < 0.001, for all three fits.