[1] Univ Paris Diderot, Sorbonne Paris Cite, Hop St Louis, Inst Natl Sante & Rech Med U944, F-75010 Paris, France
[2] Univ Paris Diderot, Sorbonne Paris Cite, Hop St Louis,Inst Univ Hematol, Lab Pathol & Virol Mol,CNRS UMR 7212, F-75010 Paris, France
[3] UCL, Mol Cell Biol Lab, MRC, London WC1E 6BT, England