1. Institute for Research in Immunology and Cancer, Montreal, QC, Canada;
2. Department of Pathology and Cell Biology, Faculty of Medicine, Université de Montréal, Montreal, QC, Canada;
3. Department of Pathology and Department of Developmental Biology, Howard Hughes Medical Institute, Stanford University, CA;
4. Leukemia Cell Bank of Quebec and Division of Hematology, Maisonneuve-Rosemont Hospital, Montreal, QC, Canada; and
5. Department of Chemistry, Faculty of Arts and Science, Université de Montréal, Montreal, QC, Canada