1. From the Laboratory of Molecular Genetics of Hemopoietic Stem Cells, Institut de Recherches en Immunovirologie et Cancérlogie, Pavillon Roger-Gaudry, Université de Montréal; the Department of Medicine, Université de Montréal, QC, Canada; the Division of Hematology, Hospital Maisonneuve-Rosemont, Montréal, QC, Canada; and the Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada.