^a Department of Neurology, Washington University School of Medicine, St. Louis, MO, USA

^b Department of Neurology, University of Texas–Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75235-9036, USA

^c DAIDS, NIAID, National Institutes of Health, Bethesda, MD, USA

^d Department of Pathology, Case Western Reserve University, Cleveland, OH, USA

^e Center for Immunology, University of Texas–Southwestern Medical Center, Dallas, TX, USA