1. National CJD Surveillance Unit, School of Molecular and Clinical Medicine (Pathology), University of Edinburgh, Western General Hospital, Edinburgh, United Kingdom.
2. Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, United Kingdom.
3. Neuropathogenesis Division, The Roslin Institute and R (D) SVS, University of Edinburgh, Edinburgh, United Kingdom.
4. SNBTS Products and Components R & D, National Science Laboratory, Edinburgh, United Kingdom.