1. Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada;
2. Baxter Laboratory for Stem Cell Biology, Department of Microbiology & Immunology, Stanford University, Palo Alto, CA;
3. Terrence Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, Canada;
4. Molecular Genetics of Stem Cells Laboratory, Institute of Research in Immunology and Cancer, University of Montreal, Montreal, QC, Canada;
5. Department of Pathology, Stanford University, Palo Alto, CA; and
6. Centre for High-Throughput Biology, University of British Columbia, Vancouver, BC, Canada