1. Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada
2. Centre for Prions and Protein Folding Diseases, Edmonton, Alberta, Canada
3. Department of Biology, University of Winnipeg, Winnipeg, Manitoba, Canada
4. Enfermedades Transmisibles Emergentes, Universidad de ZaragozaCentro de Encefalopatías y , Zaragoza, Spain
5. Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada
6. Department of Agriculture, Food and Nutritional Sciences, University of Alberta, Edmonton, Alberta, Canada