1. Department of Chemistry & Biochemistry, University of California, Los Angeles, California 90095, United States
2. California NanoSystems Institute, University of California, Los Angeles, California 90095, United States
3. Department of Stem Cell and Developmental Biology, City of Hope−Beckman Research Institute, Duarte, California 91010, United States
4. Division of Infectious Diseases, Department of Medicine, University of California, Los Angeles, California 90095, United States