1. Systemic Autoimmunity Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD 20892, USA.
2. VA Palo Alto Health Care System, Palo Alto, CA 94304, USA.
3. Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, CA 94305, USA.
4. Translational Research Program, Benaroya Research Institute at Virginia Mason, Seattle, WA 98101, USA.
5. Department of Chemistry, Middle Tennessee State University, 1301 East Main Street, Murfreesboro, TN 37132, USA.
6. Department of Medicine, Solna, Karolinska University Hospital, Stockholm S17176, Sweden.
7. Division of Veterinary Resources, Office of the Director, National Institutes of Health, Bethesda, MD 20892, USA.
8. Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01605, USA.
9. Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109, USA.