BACE1 and Alzheimer disease: To determine the extent to which this pattern of BACE1 localization in 5XFAD brain recapitulated that in human AD brain, we performed BACE1 and synaptophysin (Fig. 4j–l) or MAP2 (Fig. 4m–o) co-staining of AD hippocampal sections followed by immunofluorescence confocal microscopy.