1. Laboratory of Immunochemistry, Research Institute on Blood Diseases, Hoôpital Saint-Louis, Paris, France.
2. Chargé de Recherches á l'I.N.S.E.R.M. Laboratory of Immunochemistry, Research Institute on Blood Diseases, H#{244}pital Saint-Louis, Paris, France.
3. Laboratory of Immunochemistry, Research Institute on Blood Diseases, Hôpital Saint-Louis, Paris, France.