1. National Cancer Institute, 16132 Genova, Italy;
2. National Cancer Institute of Genova, Biotechnology Section, Rome, Italy;
3. Department of Experimental Medicine and Pathology, University of Rome “La Sapienza,” 00167 Rome, Italy;
4. Istituto Dermatologico San Gallicano, Istituto di Ricovero e Cura a Carattere Scientifico, 00100 Rome, Italy; and
5. Centre d’Immunologie de Marseille-Luminy, 13288 Marseille, France