1. From the Michael Barber Centre for Mass Spectrometry, Department of Chemistry, University of Manchester Institute of Science and Technology (UMIST), Manchester, United Kingdom; Laboratory of Mass Spectrometry and Gaseous Ion Chemistry, Rockefeller University, New York, NY; Leukaemia Research Fund Proteomics Facility, Department of Biomolecular Sciences, UMIST, Manchester, United Kingdom; and Paterson Institute for Cancer Research, Christie Hospital, Withington, Manchester, United Kingdom.