1. Autoimmunity/Diabetes Group, John P. Robarts Research Institute, London, Ontario N6G 2V4, Canada and Department of Microbiology and Immunology, University of Western Ontario, London, Ontario N6A 5C1, Canada
2. Department of Microbiology and Immunology, University of Western Ontario, London, Ontario N6A 5C1, Canada and Gene Therapy and Molecular Virology Group, John P. Robarts Research Institute, London, Ontario N6G 2V4, Canada
3. Autoimmunity/Diabetes Group, John P. Robarts Research Institute, London, Ontario N6G 2V4, Canada; Department of Microbiology and Immunology, University of Western Ontario, London, Ontario N6A 5C1, Canada and Department of Medicine, University of Western Ontario, London, Ontario N6A 5C1, Canada.