1. Centre d'Immunologie de Marseille Luminy, Aix-Marseille University, Marseille, France;
2. Inserm U631, Marseille, France;
3. Centre National de la Recherche Scientifique Unite Mixte de Recherche 6102, Marseille, France;
4. Centre Commun de Microscopie Appliquée, Université de Nice-Sophia Antipolis, Nice, France; and
5. Lymphocyte Biology Section, Laboratory of Systems Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD