[1] Inst Claudius Regaud, EA4553, F-31062 Toulouse, France
[2] Univ Toulouse 3, F-31052 Toulouse, France
[3] Ctr Natl Rech Sci, Inst Pharmacol & Biol Struct, F-31077 Toulouse, France
[4] Etab Francais Sang Pyrenees Mediterranee, Serv Ingn Cellulaire, F-31300 Toulouse, France
[5] INSERM, UMR 736, F-75000 Paris, France