1. Section of Receptor Biology & Signaling, Dept. Physiology & Pharmacology, Karolinska Institutet, Stockholm 171 77, Sweden
2. Institute of Pharmacology and Toxicology and Rudolf Virchow Center, University of Würzburg, Würzburg 97070, Germany
3. Amsterdam Institute for Molecules, Medicines and Systems, Division of Medicinal Chemistry, Faculty of Science, Vrije Universiteit Amsterdam, Amsterdam 1081 HV, The Netherlands
4. Institute of Pharmacy, Faculty of Chemistry and Pharmacy, University of Regensburg, Regensburg 93053, Germany
5. ISAR Bioscience, Planegg 82152, Germany
6. Max Delbrück Center for Molecular Medicine, Berlin 13125, Germany