1. Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg, 97080 Würzburg, Germany.
2. Cell Cycle, Biotechnology Center, Technische Universität Dresden, 01307 Dresden, Germany.
3. Biopolymers, University of Bayreuth, 95447 Bayreuth, Germany.
4. Department for Cellular Biochemistry, Max Planck Institute for Biophysical Chemistry, Göttingen, 37077 Göttingen, Germany.
5. Bioanalytical Mass Spectrometry Group, Max Planck Institute for Biophysical Chemistry, Göttingen, 37077 Göttingen, Germany.
6. Bioanalytics Institute for Clinical Chemistry, University Medical Center Göttingen, 37075 Göttingen, Germany.
7. Institute of Cancer Research, London SW7 3RP, UK.