1. Laboratory of Viral and Molecular Pathogenesis, National Institute of Neurological Disorders and Stroke (NINDS), National Institutes of Health (NIH), 36/5D04, Bethesda, MD 20892.
2. Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD 20892.
3. Laboratory of Tumor Cell Biology, National Cancer Institute, NIH, Bethesda, MD 20892.
4. Surgical Neurology Branch, NINDS, NIH, Bethesda, MD 20892.