1. Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, California 94720, United States
2. Novartis-Berkeley Center for Proteomics and Chemistry Technologies, University of California, Berkeley, Berkeley, California 94720, United States
3. Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
4. Novartis Institutes for BioMedical Research, Cambridge, Massachusetts 02139, United States
5. Novartis Institutes for BioMedical Research, Emeryville, California 94608, United States
6. Department of Nutritional Sciences and Toxicology, University of California, Berkeley, Berkeley, California 94720, United States