1. Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR 97403
2. Institute of Molecular Biology, University of Oregon, Eugene, OR 97403
3. College of Science, NMR Facility, Oregon State University, Corvallis, OR 97331
4. Biophysics Graduate Program, University of California, Berkeley, Berkeley, CA 94720
5. Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720
6. Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720
7. California Institute for Quantitative Biosciences, University of California, Berkeley, Berkeley, CA 94720