Miguel Beato,’ Peter Herrlich,t and Giinther Schlitz* *Institut ftir Molekularbiologie und Tumorforschung Philipps-Universitat Marburg Emil-Mannkopff-Strasse 2 D-35037 Marburg Federal Republic of Germany tForschungszentrum Karlsruhe lnstitut fiir Genetik D-76021 Karlsruhe Federal Republic of Germany *Deutsches Krebsforschungszentrum Im Neuenheimer Feld 280 D-691 20 Heidelberg Federal Republic o...

1 University of Wuerzburg, Department of Neurology, Josef-Schneider-Str. 11, 97080 Wuerzburg, Germany 2 Westfaelische Wilhelms-University Muenster, Institute of Physiology, Robert-Koch Str. 27a, 48149 Muenster, Germany 3 University of Virginia, Department of Pharmacology, Charlottesville, Virginia 22908, USA 4 University of Heidelberg, Department of Neuroradiology, Im Neuenheimer Feld 400, 6912...

Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. Georgi BontcheV Str. Bl.11, 1113 Sofia, Bulgaria, Anorganisch-Chemisches Institut, UniVersität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany, Département de Chimie, UniVersité de Fribourg, Ch. du Musée 9, CH-1700 Fribourg, Switzerland, and Département de Chimie Physique, UniVersité de GenèVe, G...