1. Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
2. Department of Bioengineering, University of California, Los Angeles, Los Angeles, California 90095, United States
3. California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
4. Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States
5. Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
6. Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, United States
7. Department of Biopharmaceutical Sciences, University of Illinois at Chicago, Chicago, Illinois 60612, United States
8. Institute for Integrated Cell-Material Sciences, Kyoto University, Kyoto 606-8302, Japan