1 Calgary Prion Research Unit, Faculty of Veterinary Medicine, Hotchkiss Brain Institute, University of Calgary, 3280 Hospital DR NW, Calgary, T2N 4Z6, Canada. sgilch@ucalgary.ca.
2 Calgary Prion Research Unit, Faculty of Veterinary Medicine, Hotchkiss Brain Institute, University of Calgary, 3280 Hospital DR NW, Calgary, T2N 4Z6, Canada. hschaetz@ucalgary.ca.