1. Department of Bioengineering, University of Washington, Seattle, WA 98195
2. Institute for Protein Design, University of Washington, Seattle, WA 98195
3. Department of Biochemistry, University of Washington, Seattle, WA 98195
4. Department of Molecular and Cellular Biology, University of Washington, Seattle, WA 98195
5. Department of Neurology, University of Washington, Seattle, WA 98195
6. Molecular Engineering and Sciences Institute, University of Washington, Seattle, WA 98195