1. From the MRC Centre for Neuromuscular Diseases (A.M.R., M.M.R.), Department of Neurodegenerative Disease (Z.J.), Queen Square Brain Bank (Z.J., G.H.), and Dementia Research Centre (M.N.R.), UCL Institute of Neurology; National Hospital for Neurology and Neurosurgery (A.M.R., M.M.R., M.N.R.); and Division of Neuropathology (Z.J.), National Hospital for Neurology and Neurosurgery, University College London Hospitals NHS Foundation Trust, Queen Square, UK.