1. Broad Institute of Harvard and Massachusetts Institute of Technology (MIT), MA 02139, USA.
2. Division of Health Sciences and Technology, MIT, Cambridge, MA 02139, USA.
3. Program for Evolutionary Dynamics, Department of Organismic and Evolutionary Biology, Department of Mathematics, Harvard University, Cambridge, MA 02138, USA.
4. Department of Applied Mathematics, Harvard University, Cambridge, MA 02138, USA.
5. Program in Gene Function and Expression and Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01605, USA.
6. Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.
7. Department of Radiation Oncology, University of Washington School of Medicine, Seattle, WA 98195, USA.
8. Department of Genome Sciences, University of Washington, Seattle, WA 98195, USA.
9. Department of Pathology, Harvard Medical School, Boston, MA 02115, USA.
10. Department of Pediatrics, University of Washington, Seattle, WA 98195, USA.
11. Department of Physics, MIT, Cambridge, MA 02139, USA.
12. Department of Biology, MIT, Cambridge, MA 02139, USA.
13. Department of Systems Biology, Harvard Medical School, Boston, MA 02115, USA.