1 Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Martinsried, Germany.
2 Proteomics and Signal Transduction, Max Planck Institute of Biochemistry, Martinsried, Germany. mmann@biochem.mpg.de.
3 Proteomics Program, Novo Nordisk Foundation Center for Protein Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark. mmann@biochem.mpg.de.