1. Department of Immunology, The Scripps Research Institute, La Jolla, California 92037
2. Department of Genetics and Microbiology, University of Geneva, 1211 Geneva 4, Switzerland
3. Department of Cellular and Molecular Medicine, Glycobiology Research and Training Center, University of California, San Diego, La Jolla, California 92093-0687
4. Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115
5. Department of Medicine, Greater Los Angeles Veterans Affairs Medical Center, Los Angeles, California 90073
6. Center for Human Genetics, University of Leuven and Flanders Interuniversity Institute for Biotechnology, B-3000 Leuven, Belgium