1. Department of Comparative Biology & Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
2. Calgary Prion Research Unit, University of Calgary, Calgary, Alberta, Canada
3. Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada
4. Department of Biochemistry and Molecular Biology, Faculty of Pharmacy, Helwan University, Cairo, Egypt
5. Department of Neurochemistry, Tohoku University Graduate School of Medicine, Sendai, Japan