1. Whitehead Institute for Biomedical Research, Nine Cambridge Center, Cambridge, MA 02142, USA.
2. Department of Biology, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.
3. Computational and Systems Biology Initiative, MIT, Cambridge, MA 02139, USA.
4. David H. Koch Institute for Integrative Cancer Research at MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
5. Department of Cancer Biology, Dana-Farber Cancer Institute (DFCI), 250 Longwood Avenue, Boston, MA 02115, USA.
6. Blais Proteomics Center, DFCI, 250 Longwood Avenue, Boston, MA 02115, USA.
7. Howard Hughes Medical Institute, MIT, Cambridge, MA 02139,USA.
8. Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 250 Longwood Avenue, Boston, MA 02115, USA.