1. Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), DKFZ—ZMBH Alliance Heidelberg 69120,
2. (until 2009) Department of Biochemistry I, Medical Faculty, University of Göttingen Göttingen 37073,
3. Centre for Organismal Studies (COS Heidelberg), University of Heidelberg Heidelberg 69120,
4. Miltenyi Biotec GmbH Bergisch‐Gladbach 51429,
5. Department of Bioanalytical Mass Spectrometry, Max Planck‐Institute for Biophysical Chemistry Göttingen 37077 Germany
6. Division of Cell Biology, Netherlands Cancer Institute Amsterdam 1066 CX The Netherlands