1. Max F. Perutz Laboratories, Center for Molecular Biology, University of Vienna, 1030 Vienna, Austria
2. Max F. Perutz Laboratories, Department of Biochemistry, Mass Spectrometry Facility, University of Vienna, 1030 Vienna, Austria
3. Max F. Perutz Laboratories, Department of Medical Biochemistry, Medical University of Vienna, 1030 Vienna, Austria