1. Joseph and Kathleen Bryan Alzheimer's Disease Research Center, Duke University Medical Center, Durham, NC 27710.
2. Department of Medicine, Neurology, and Neurobiology, Joseph and Kathleen Bryan Alzheimer's Disease Research Center, Duke University Medical Center, Durham, NC 27710, and Durham VA Medical Center, Durham, NC 27710.
3. Neuropsychiatric Institute and Hospital, Center for Health Sciences, University of California, Los Angeles, CA 90024.
4. Molecular Neurogenetics Unit, Massachusetts General Hospital, Charlestown, MA 02129.