1. From University College London (UCL) Huntington’s Disease Centre, Department of Neurodegenerative Disease, Queen Square Institute of Neurology, UCL, and the U.K. Dementia Research Institute at UCL, London (S.J.T., E.J.W.), the Department of Clinical Neuroscience, Addenbrooke’s Hospital, University of Cambridge, Cambridge (R.A.B., N.F.B.), Manchester Centre for Genomic Medicine, St. Mary’s Hospital, Manchester University NHS Foundation Trust, and the Division of Evolution and Genomic Sciences, School of...