1. Department of Chemistry, York University, Toronto, Ontario, Canada M3J 1P3
2. Dana Farber Institute, Harvard University, Boston, Massachusetts 02215, United States
3. Biomolecular Interaction Centre and School of Biological Sciences, Canterbury University, Christchurch 8041, New Zealand
4. Bio21 Molecular Science and Biotechnology Institute, Department of Biochemistry and Molecular Biology, University of Melbourne, Parkville, Victoria 3010, Australia
5. Centre for Research in Mass Spectrometry, Toronto, Ontario, Canada M3J 1P3