1. Department of Chemistry, University of California, Berkeley, California 94720, United States
2. Novartis-Berkeley Center for Proteomics and Chemistry Technologies, Cambridge, Massachusetts 02139, United States
3. Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, California 94720, United States
4. Department of Nutritional Sciences and Toxicology, University of California, Berkeley, Berkeley, California 94720, United States
5. Innovative Genomics Institute, Berkeley, California 94720, United States
6. Materials Sciences Division, Lawrence Berkeley National Laboratories, Berkeley, California 94720,United States