1. Institute of Pharmacy, University of Regensburg, Universitätsstraße 31, Regensburg 93053, Germany
2. Section of Receptor Biology & Signaling, Dept. of Physiology & Pharmacology, Karolinska Institutet, Solnavägen 1, Stockholm 171 77, Sweden
3. Max Delbrück Center for Molecular Medicine, Robert-Rössle-Straße 10, Berlin 13125, Germany
4. Institute of Pharmacology and Toxicology and Rudolf Virchow Center, University of Würzburg, Josef-Schneider-Straße 2, Würzburg 97070, Germany
5. ISAR Bioscience Institute, Semmelweisstraße 5, Planegg 82152, Germany
6. Department of Neurology, University of Minnesota, 2101 6th Street SE, Minneapolis, Minnesota 55455, United States
7. Department of Medicinal Chemistry, Institute for Therapeutics Discovery and Development, University of Minnesota, Minneapolis, Minnesota 55414, United States