1. Institute for Research in Immunology and Cancer, Montréal, QC, Canada;
2. Maisonneuve-Rosemont Hospital Research Center, Montréal, QC, Canada;
3. Genetics Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD; and
4. Department of Pharmacology,
5. Program of Molecular Biology, Department of Computer Science and Operations Research, and
6. Department of Biochemistry, Université de Montréal, Montréal, QC, Canada