1 Centre d'Immunologie de Marseille-Luminy, Aix-Marseille University UM2, Inserm, U1104, CNRS UMR7280, 13288 Marseille, France. Electronic address: vivier@ciml.univ-mrs.fr.
2 Howard Hughes Medical Institute and Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06520, USA. Electronic address: Ruslan.Medzhitov@yale.edu.