1. Department of Chemistry and Biochemistry University of California Santa Barbara Santa Barbara CA 93106 USA
2. Center for Bioengineering University of California Santa Barbara Santa Barbara CA 93106 USA
3. Department of Psychological and Brain Sciences University of California Santa Barbara
4. Department of Chemistry Washington University in St. Louis St. Louis MO 63130 USA
5. Department of Molecular Cellular and Developmental Biology University of California Santa Barbara