1. Max Planck Institute for Molecular Genetics, Ihnestrasse 73, 14195 Berlin, Germany, Medical Proteome Center, Ruhr-University Bochum, Universitätsstrasse 150, 44780 Bochum, Germany, PROTAGEN AG, Emil-Figge-Strasse 76A, 44227 Dortmund, Germany, and The Centre for Human Proteomics, Royal College of Surgeons in Ireland, Dublin 2, Ireland