1. From the Laboratory of Hematology, University Hospital, Nantes, France; Laboratory of Hematology, University Hospital, Limoges, France; Laboratory of Hematology, Hopital Lyon-Sud, Pierre-Bénite, France; Laboratory of Cytogenetics, General Hospital, Versailles; Laboratory of Cytogenetics, Institute Paoli-Calmette, Marseille, France; and Laboratory of Cytogenetics, Hospital Val-de-Grace, and Laboratory of Hematology, Hotel-Dieu, Paris, France.