1. Miriam Marks Department of Neurochemistry, Institute of Neurology, London, U.K.
2. School of Biological and Molecular Science, Oxford Brookes University, Gipsy Lane, Headington, Oxford OX3 OBP, U.K.
3. Department of Pharmacology, School of Pharmacy, 29-31 Brunswick Square, London WClN 1AX, U.K.
4. Department of Neuropathology, University of Oxford, Radcliffe Infirmary, Woodstock Road, Oxford OX2 6HE, U.K.
5. Department of Pathology and Neuropathology Laboratory, The Johns Hopkins University School of Medicine, Baltimore, MD 21205-2196, U.S.A.
6. CNS Department of Biophysics and Molecular Biology, Bristol Myers Squibb Pharmaceutical Research Institute, Wallingford, CT 06492-7660, U.S.A.
7. Department of Neurology, Harvard Medical School, Boston, MA 02129, U.S.A.