1. Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569, United States
2. Liggins Institute, University of Auckland, Auckland 1203, New Zealand
3. Maurice Wilkins Centre for Molecular Biodiscovery, Auckland 1023, New Zealand
4. Auckland Cancer Society Research Centre, School of Medical Sciences, University of Auckland, Auckland 1023, New Zealand
5. California NanoSystems Institute, University of California, Los Angeles, California 90095-1569, United States
6. Department of Bioengineering, University of California, Los Angeles, California 90095-1569, United States