1. Ion Cyclotron Resonance Program, National High Magnetic Field Laboratory, 1800 E. Paul Dirac Dr., Tallahassee, Florida 32310, United States
2. National Resource for Translational and Developmental Proteomics, Northwestern University, Evanston, Illinois 60208, United States
3. NCI RAS Initiative, Frederick National Laboratory for Cancer Research, Frederick, Maryland 21702, United States
4. Department of Chemistry and Biochemistry, Florida State University, 95 Chieftan Way, Tallahassee, Florida 32306, United States