1. Department of Biochemistry, University of Washington, Seattle, WA 98195, USA.
2. Institute for Protein Design, University of Washington, Seattle, WA 98195, USA.
3. Department of Medicinal Chemistry, University of Washington, Seattle, WA 98195, USA.
4. Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA.
5. Howard Hughes Medical Institute, Janelia Research Campus, Ashburn, VA 20147, USA.
6. Graduate Program in Biological Physics, Structure, and Design, University of Washington, Seattle, WA, USA.
7. Department of Bioengineering, University of California, Berkeley, CA 94720, USA.
8. Department of Bioengineering, University of Washington, Seattle, WA 98195, USA.
9. Molecular Biophysics and Integrated Bioimaging, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720.
10. Howard Hughes Medical Institute, University of Washington, Seattle, WA 98195, USA.