MAOB and Alzheimer disease: In hippocampal and cerebellar sections immunostained with the peroxidase-DAB method we had noted that only rare pyramidal neurons were immunoreactive for MAO-B in the hippocampal CA1 region from either CTRL or AD donors, whereas many granular cells in the dentate gyrus did express MAO-B (Supplemental Fig. S4a) and cerebellar Purkinje cells exhibited very limited or no immunostaining in both CTRL and AD donors (Supplemental Fig. S4b).