1. INSERM U932, Immunity and Cancer, Institut Curie, F-75248 Paris Cedex 05, France.
2. Institute of Infection Immunology, Centre for Experimental and Clinical Infection Research, TWINCORE, D-30625 Hannover, Germany.
3. INSERM U668, Department of Immunology, Institut Pasteur, F-75015 Paris, France.
4. CNRS UMR 168, Laboratoire de Physico-Chimie Curie, Institut Curie, F-75248 Paris Cedex 05, France.