1. Department of Systems Biology, Harvard Medical School, Boston, Massachusetts 02115, United States
2. Wyss Institute for Biologically Inspired Engineering, Boston, Massachusetts 02115, United States
3. Institute for Protein Design, University of Washington, Seattle, Washington 98195, United States
4. Department of Biochemistry, University of Washington, Seattle, Washington 98195, United States
5. Howard Hughes Medical Institute, University of Washington, Seattle, Washington 98195, United States
6. Broad Institute of Harvard and MIT, Cambridge, Massachusetts 02142, United States
7. Department of Systems & Computational Biology, Albert Einstein College of Medicine, Bronx, New York 10461, United States