[1] Univ Mediterranee, CNRS, INSERM, Ctr Immunol Marseille Luminy, F-13288 Marseille 9, France
[2] Inst J Paoli I Calmettes, INSERM, U119, F-13009 Marseille, France
[3] Inst Biol Mol & Cellulaire, CNRS, UPR 9022, F-67084 Strasbourg, France
[4] Univ Montpellier I, Ctr Biochim Struct, CNRS, UMR 5048,INSERM,UMR 554, F-34090 Montpellier, France
[5] Natl Inst Genet, Mishima, Shizuoka 411, Japan