1. Department of Neurology, Gunma University, Gunma 371, Japan..
2. Division of Neuropathology, Institute of Pathology, Case Western Reserve University, Cleveland, OH 44106.
3. Department of Pathology, New York University Medical Center, New York, NY 10016.
4. Department of Molecular Biology and Pharmacology, Washington University Medical School, St. Louis, MO 63110.
5. Department of Neurology and the Alzheimer's Disease Research Center, University of Texas Southwestern Medical Center, Dallas, TX 75235.