1. Laboratory of Molecular Immunogenetics, National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, MD 20892, USA.
2. Light Imaging Section, Office of Science and Technology, National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, MD 20892, USA.
3. Department of Immunology, Duke University School of Medicine, Durham, NC 27710, USA.
4. Department of Laboratory Medicine, University of California, San Francisco, CA 94143, USA.