1. Division of Chemistry and Chemical
Engineering, California Institute of Technology, Pasadena, California 91125, United States
2. Division of Biology, California Institute of Technology, Pasadena, California
91125, United States
3. Proteome Exploration Laboratory,
Beckman Institute, California Institute of Technology, Pasadena, California 91125, United States
4. Molecular Instrumentation Center, University of California, Los Angeles, California 90095,
United States
5. Department
of Chemistry and
Biochemistry, University of California,
Los Angeles, California 90095, United States
6. Department of Biological Chemistry,
David Geffen School of Medicine, University of California, Los Angeles, California 90095, United States