There were no significant differences in Bsn levels in Bsn‐positive puncta, in area of Bsn‐positive puncta, in levels of Homer or in levels of another AZ protein Rab‐interacting molecule (RIM) (Figures 1A and S3a–c,e), indicating that AD or DLB did not majorly alter the general morphology of the AZ and PSD. This evidence concerns the gene BSN and Alzheimer disease.