CNR1 and Alzheimer disease: A PET imaging study in a rodent model of AD showed age- and genotype-dependent alterations in [18F]FMPEP-d2 binding to CB1 9, while a human study with [18F]MK-9470 and [11C]PIB found no correlation between CB1 availability and β-amyloid (Aβ) deposition 10.