1. Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
2. Department of Chemical Engineering, University of California, Davis, Davis, California 95616, United States
3. Department of Microbiology and Immunology, University of Otago, Dunedin 9016, New Zealand
4. Department of Biochemistry, University of Otago, Dunedin 9016, New Zealand
5. Department of Pharmacology, University of California, San Diego, La Jolla, California 92093, United States