1. *Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada;
2. †Cell Signaling and Immunity Section, Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD;
3. ‡Center for Immunology, University of Minnesota, Minneapolis, MN; and
4. §Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN