1. Department of Chemistry University of Wisconsin–Madison Madison WI 53706 USA
2. Ion Cyclotron Resonance Program National High Magnetic Field Laboratory Tallahassee FL 32310 USA
3. Proteomics Center of Excellence Northwestern University Evanston IL 60208 USA
4. Department of Cell and Regenerative Biology and Human Proteomics Program University of Wisconsin–Madison Madison WI 53706 USA
5. Department of Chemistry and Molecular Biosciences and the Division of Hematology and Oncology Northwestern University Evanston IL 60208 USA
6. Department of BioHealth Informatics Indiana University–Purdue University Indianapolis IN 46202 USA
7. Center for Computational Biology and Bioinformatics Indiana University School of Medicine Indianapolis IN 46202 USA
8. Department of Biology Brigham Young University Provo UT 84602
9. Department of Chemistry Michigan State University East Lansing MI 48824 USA
10. Department of Chemistry and Biochemistry University of Oklahoma Norman OK 73019 USA