1. Département d'Immunologie, Institut Cochin, INSERM U567, CNRS UMR 8104, Université René Descartes, Hôpital Cochin
2. Museum National d'Histoire Naturelle, Paris, France
3. Department of Cell Biology and Immunology, Faculty of Medicine, Vrije Universiteit, Amsterdam 1081 BT, The Netherlands
4. Medical Polyclinic, University of Munich, 80336 Munich, Germany
5. Department of Microbiology and Institute for Cellular and Molecular Biology, University of Texas, Austin, Texas 78712-1095