Comorbid Alzheimer's disease (AD) pathology is commonly observed, particularly in DLB, in the form of extracellular amyloid plaques, of amyloid‐beta (Aβ) peptide, along with neurofibrillary tangles (NFT) and neuropil threads of hyperphosphorylated tau (HPT) protein 42. The gene discussed is MAPT; the disease is Alzheimer disease.