1. INSERM U580, Hôpital Necker, Paris, France
2. Department of Pathology, University of Chicago, Chicago, IL
3. Brigham and Women's Hospital, Harvard Medical School, Boston, MA
4. Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA
5. Experimental Immunology, Department of Research, University Hospital, Basel, Switzerland
6. La Jolla Institute for Allergy and Immunology, San Diego, CA
7. Department of Microbiology and Immunology and the Cancer Research Institute, University of California, San Francisco, San Francisco, CA
8. Department of Molecular and Cell Biology, University of California, Berkeley, CA
9. Department of Medicine and Section of Immunobiology, Yale University School of Medicine, New Haven, CT