About the editors Stefan Offermanns Stefan Offermanns is Professor of Pharmacology and director of the Institute of Pharmacology at the University of Heidelberg. He holds an MD degree from the Free University (FU) Berlin and has worked as a Post-Doc in Pharmacology in Berlin and at the California Institute of Technology, Pasadena/CA. In 1997, he was appointed group leader at the Institute of Pharmacology of the FU Berlin, then became a Heisenberg Scholar in 1999 before moving on to Heidelberg in 2000. His field of interest includes cellular and biological functions of G-protein-mediated signal transduction processes in the cardiovascular and nervous system, regulation of cellular functions via members of the plexin B family, and the characterization of new G-protein-coupled receptors / G-protein-coupled receptors as pharmacological targets. Walter Rosenthal Walter Rosenthal is the director of the Leibniz Institute for Molecular Pharmacology and Professor for Molecular Pharmacology at the Charite University Hospital in Berlin. He is a medical doctor by training (Giessen/Germany, London) and held positions at the Universities of Heidelberg, Berlin and Giessen, and at Baylor College of Medicine, Houston/TX. He is interested in intracellular protein trafficking, scaffolding proteins, G-protein-coupled receptors, cAMP/PKA-triggered pathways, aquaporins, molecular defects underlying human disease, and pharmacological interference.