[1] Ist Nazl Tumori Fond D Pascale, Lab Viral Oncogenesis & Immunotherapies, I-80131 Naples, Italy
[2] Ist Nazl Tumori Fond D Pascale, Dept Expt Oncol, AIDS Reference Ctr, I-80131 Naples, Italy
[3] NIH, Dept Transfus Med, Immunogenet Sect, Bethesda, MD 20892 USA
[4] Univ Maryland, Inst Human Virol, Sch Med, Baltimore, MD 21201 USA
[5] Ist Super Sanita, Dept Cell Biol & Neurosci, I-00161 Rome, Italy