1. Division of Immunology, Lowance Center for Human Immunology, Department of Medicine, Emory University, Atlanta, GA 30322, USA.
2. Department of Chemistry, Emory University, Atlanta, GA 30322, USA.
3. Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT 84112, USA.
4. Rosalind Russell and Ephraim P. Engleman Rheumatology Research Center, Departments of Medicine and of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143, USA.
5. Department of Microbiology and Immunology, Emory University, Atlanta, GA 30322, USA.