[1] UNIV MILAN,OSPED SAN RAFFAELE,DIPARTIMENTO RIC BIOL & TECNOL,MOLEC GENET UNIT,I-20127 MILAN,ITALY
[2] UNIV MILAN,DIPARTIMENTO GENET & BIOL MICROORGANISMI,I-20127 MILAN,ITALY
[3] AARHUS UNIV,DEPT BIOCHEM MED,DK-8000 AARHUS,DENMARK
[4] AARHUS UNIV,DEPT CELL BIOL,DK-8000 AARHUS,DENMARK
[5] AARHUS UNIV,DEPT BIOL MOLEC,DK-8000 AARHUS,DENMARK
[6] UNIV TURIN,DIPARTIMENTO SCI MED,NOVARA,ITALY
[7] HOSP SAN RAFFAELE,INST SCI,DIBIT,CLIN IMMUNOL UNIT,I-20132 MILAN,ITALY