1. Neurogenetics Laboratory, Massachusetts General Hospital, and Department of Genetics and the Program m Neuroscience, Harvard Medical School, Boston, MA 02114.
2. Clinical Neuropharmacology Section, Medical Neurology Branch, National Institute of Neurological and Communicative Disorders and Stroke, Bethesda, MD 20892.
3. Department of Medical Genetics, Indiana University School of Medicine, Indianapolis, IN 46223.
4. Integrated Genetics Inc., Framingham, MA 01701.
5. Department of Neurology, Boston University Medical School, Boston, MA 02118.
6. Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114
7. Department of Neurology, University of Massachusetts Medical School, and the University of Massachusetts Medical Center, Worcester, MA 01605.
8. Department of Neurology, Massachusetts General Hospital, and Harvard Medical School, Boston, MA 02114.
9. Servizio di Neurologica, USL 17 Regione Calabria, Italy.
10. Laboratoire de Neurohistologie, Ecole Pratique des Hautes Etudes, and INSERM U 106 la Salpetriere, Paris, France.
11. Centre National de Transfusion Sanguine, Paris, France.
12. Kreiskrankenhaus Lemgo, Neurologische Abteilung, D492 Lemgo, West Germany.
13. Instituto di Malattie Nervose e Mentali, University of Florence, Florence, Italy.