1. GE Healthcare Bio-Sciences AB, SE-75184, Uppsala, Sweden, The Informatics Factory, New York, New York 10012, Laboratory for Biological and Medical Mass Spectrometry (BMMS), Uppsala University, Box 583, SE-751 23 Uppsala, Sweden, Department of Pharmaceutical Biosciences, Uppsala University, Biomedical Centre, SE-75123 Uppsala, Sweden, and Department of Physiology and Pharmacology, Karolinska Institutet, SE-17177 Stockholm, Sweden