Both AD and PD are afflicted with protein aggregates, whether Aβ, tau,8 or α‐synuclein,35 dysregulation of NTSs,63, 104, 105 neuronal death,105, 111 inflammation,37, 112 oxidative stress,42, 113 and excitotoxicity.114, 115. The gene discussed is MAPT; the disease is Parkinson disease.