1. Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32304, United States
2. Bruker Daltonics, Billerica, Massachusetts 01821, United States
3. Bruker Daltonics, 28359 Bremen, Germany
4. Functional Proteomics, Jena University Hospital, 07747 Jena, Germany
5. Institute of Molecular Biophysics, Florida State University, Tallahassee, Florida 32304, United States