1. Electrical and Computer Engineering Department, University of California, Los Angeles, California 90095, USA
2. Bioengineering Department, University of California, Los Angeles, California 90095, USA
3. California NanoSystems Institute (CNSI), University of California, Los Angeles, California 90095, USA
4. Howard Hughes Medical Institute, University of California, Los Angeles, California 90024, USA
5. Department of Energy Institute, University of California, Los Angeles, California 90024, USA
6. Biological Chemistry Department, University of California, Los Angeles, California 90024, USA
7. Chemistry and Biochemistry Department, University of California, Los Angeles, California 90024, USA
8. Molecular Biology Institute, University of California, Los Angeles, California 90024, USA
9. Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC, BIST, and CIBER-BBN, Campus UAB, Bellaterra, 08193 Barcelona, Spain
10. Department of Surgery, David Geffen School of Medicine, University of California, Engr. IV 68-119, 420 Westwood Plaza, Los Angeles, California 90095, USA