1. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
2. Ragon Institute of MGH, MIT, and Harvard, Cambridge, Massachusetts 02139, United States
3. The Broad Institute of MIT and Harvard, Cambridge, Massachusetts 02142, United States
4. Department of Molecular Biology and Center for Computational and Integrative Biology, Massachusetts General Hospital, Boston, Massachusetts 02139, United States
5. Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115, United States
6. Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602, United States
7. Department of Microbiology, Harvard Medical School, Boston, Massachusetts 02115, United States
8. Koch Institute for Integrative Cancer Research, MIT, Cambridge, Massachusetts 02139, United States