1Whitehead Institute for Biomedical Research, 9 Cambridge Center, Cambridge, MA 02142 USA
2Cancer Genomics Program, Broad Institute, Cambridge, MA 02141 USA
3MGH Center for Cancer Research, Charlestown, MA 02129 USA
4Ecole Normale Superieure, 75230 Paris Cedex 05, France
5EMI 0229 INSERM, CRLC Val d'Aurelle-Paul Lamarque, 34298 Montpellier Cedex 5, France
6Department of Molecular Genetics & Development, Ben Gurion University of the Negev, Beer Sheva 84105, Israel
7Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA