1. Department of Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
2. Division of Biochemistry, Department of Medicine, University of Fribourg. Chemin du Musée 5, CH 1700 Fribourg, Switzerland
3. Biochemie-Zentrum Heidelberg, Im Neuenheimer Feld 328, 3. OG, D-69120, Heidelberg, Germany