1. La Jolla Institute for Allergy and Immunology, San Diego, California 92121
2. Department of Biology, University of California at San Diego, San Diego, California 92093
3. CREST (Core Research for Evolutional Science and Technology) and the Department of Molecular Immunology, Chiba University Graduate School of Medicine, Chiba 260-8670, Japan
4. Department of Pathology, Gwenn Knapp Center For Lupus and Immunology Research, University of Chicago, Chicago, Illinois 60637
5. Pharmaceutical Research Laboratory, Kirin Brewery Company Limited, Gunma 370-12, Japan