1. Institute of Physiology, Medical Faculty (C.B., Y.F.), RWTH Aachen, D-52057 Aachen, Germany
2. Interdisciplinary Center of Clinical Research BIOMAT, Medical Faculty (C.B.), RWTH Aachen, D-52057 Aachen, Germany
3. Departament de Bioquímica i Biologia Molecular, Facultat de Biologia, Universitat de Barcelona (L.S., E.T., M.P., A.Z.), 08028 Barcelona, Spain
4. Solvay Pharmaceuticals, Inc. (Y.F.), D-30173 Hannover, Germany