1. Department of Chemistry and Biochemistry 9510, University of California, Santa Barbara, California 93106, United States
2. Program in Chemical Engineering, University of California, Santa Barbara, California 93106, United States
3. MRC Laboratory of Molecular Biology, Cambridge Biomedical Campus, Cambridge CB2 0QH, U.K.
4. IBMM, CNRS, University of Montpellier, ENSCM, 34090 Montpellier, France
5. Program in Biomolecular Sciences and Engineering, University of California, Santa Barbara, California 93106, United States
6. Department of Chemistry and Biochemistry, University of California, San Diego, California 92093, United States
7. Salk Institute for Biological Studies, La Jolla, California 92037, United States