1. Smurfit Institute of Genetics, Lincoln Place Gate, Trinity College Dublin, Dublin 2, Ireland.
2. Laboratory for Neurodegenerative Research, Center for Neurological Diseases, Brigham and Women’s Hospital, Harvard Institute of Medicine, 77 Avenue Louis Pasteur, Boston, MA 02115, USA.
3. Department of Neuropathology, Beaumont Hospital, Dublin 9, Ireland.
4. UCD School of Veterinary Medicine and Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Dublin 4, Ireland.
5. Ross University School of Veterinary Medicine, P. O. Box 334, Basseterre, St. Kitts, West Indies.