MAOB and Alzheimer disease: Elevation of MAO-B levels in autopsy-confirmed AD brains has been consistently observed in mRNA levels and in vitro binding studies with MAO-B radioligands such as [3H]-L-deprenyl and [3H]lazabemide (Jossan et al., 1991b; Saura et al., 1994; Gulyas et al., 2011; Marutle et al., 2013; Jo et al., 2014; Ni et al., 2021).