1. Department of Microbiology, Immunology, and Molecular Genetics, University of California, Los Angeles, California; University of Modena and Reggio Emilia, Italy.
2. Genethon, Evry, France; and University of Modena and Reggio Emilia, Italy.
3. Dipartimento di Scienza Della Vita, University of Modena and Reggio Emilia, Italy.