1. Department of Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia, Canada.
2. Life Sciences Institute, Department of Biochemistry and Molecular Biology, The University of British Columbia, Vancouver, British Columbia, Canada.
3. Department of Biochemistry, University of Washington, Seattle, WA, USA.
4. Institute for Protein Design, University of Washington, Seattle, WA, USA.
5. Structural Biology Brussels, Vrije Universiteit Brussel (VUB), Brussels, Belgium.
6. VIB-VUB Center for Structural Biology, VIB, Brussels, Belgium.
7. Department of Microbiology and Molecular Medicine, University of Geneva, Geneva, Switzerland.
8. Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR, USA.