1. From the Departments of Neurology, Anatomy, and Neurobiology, and Pathology & Laboratory Medicine (M.F.), University of California, Irvine, Calif; Department of Pathology (S.F.), Harbor-UCLA Medical Center, Torrance, Calif; Department of Pathology (P.J.), Harbor-UCLA Medical Center, Torrance, Calif; Department of Pathology & Laboratory Medicine and Neurology (R.C.K.), University of California, Irvine, Calif.