1. Department
of Chemical Physiology, The Scripps Research Institute, La Jolla, California 92037, United States
2. Departments of Chemistry and Biochemistry, University of Oxford, Oxford, United Kingdom
3. Biomolecular Mass
Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research
and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands
4. Netherlands Proteomics Centre, Utrecht, The Netherlands