1. Department of Chemistry & Loker Hydrocarbon Research Institute, University of Southern California, Los Angeles, California 90089, United States
2. Department of Biological Sciences, Division of Molecular and Computational Biology, University of Southern California, Los Angeles, California 90089, United States
3. Translational Imaging Center, Michelson Center for Convergent Bioscience, University of Southern California, Los Angeles, California 90089, United States