1. Institut für Pharmakologie und Toxikologie, RWTH Aachen, D-52057 Aachen, Germany (A.G., K.D.K.)
2. Abteilung Biochemie, Universität Greifswald, D-17487 Greifswald, Germany (D.S.)
3. Department of Molecular Pharmacology, Stanford University School of Medicine, Stanford, California 94305 (R.A.R.)
4. German Institute of Human Nutrition, D-14558 Potsdam-Rehbrücke, Germany (H.-G.J.)