1. Department of Chemistry, University of California, Irvine, California 92697-2025, United States
2. Department of Molecular Biology and Biochemistry, University of California, Irvine, California 92697-3900, United States
3. California Institute for Telecommunications and Information Technology, University of California, Irvine, California 92697-3900, United States
4. Departments of Sociology, Statistics, Computer Science, and Electrical Engineering and Computer Science, University of California, Irvine, California 92697-3900, United States