1. Department of Biochemistry and Molecular Biology, Faculty of Medicine, Life Sciences Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
2. Department of Biochemistry, Faculty of Science, University of Regina, Regina, Saskatchewan S4S 0A2, Canada
3. Department of Biochemistry and Molecular Biology, Faculty of Medicine, Michael Smith Laboratory, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada