1. Department of Pharmaceutical Sciences, University of California, Irvine, CA 92697-3958, USA
2. Department of Chemistry, University of California, Irvine, CA 92697-3958, USA
3. Department of Molecular Biology and Biochemistry, University of California, Irvine, CA 92697-3958, USA
4. Department of Chemical and Biomolecular Engineering, University of California, Irvine, CA 92697-3958, USA