1. Department of Genome Sciences, University of Washington, Seattle, Washington 98195 United States
2. Science for Life Laboratory, KTH - Royal Institute of Technology, Box 1031, 17121 Solna, Sweden
3. Pacific Northwest National Laboratory, Richland, Washington 99352, United States
4. Proteomics Center of Excellence & Departments of Chemistry and Molecular Biosciences, Northwestern University, Evanston, Illinois 60208, United States
5. Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
6. Department of Pathology, Stanford University, Stanford, California 94305, United States