1. Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
2. Whitehead Institute for Biomedical Research, Cambridge, Massachusetts 02142, United States
3. Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
4. The Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, 500 Main Street, Cambridge, Massachusetts 02142, United States
5. Center for Environmental Health Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
6. Broad Institute of MIT and Harvard, 415 Main Street, Cambridge, Massachusetts 02142, United States