1. Materials Science and Engineering Program, University of California, San Diego, La Jolla, California 92093, United States
2. Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
3. Department of Medicine, University of California, San Diego, La Jolla, California 92093, United States
4. Leidos, 10260 Campus Point Drive, San Diego, California 92121, United States