1. D. Bevec, H. Jaksche, M. Himmelspach, A. Pacher, M. Schebesta, K. Koettnitz, M. Dobrovnik, R. Csonga, J. Hauber, Sandoz Research Institute, Department of Immunodermatology, A-1235 Vienna, Austria.
2. M. Oft, Research Institute of Molecular Pathology, A-1030 Vienna, Austria.
3. T. Wöhl and F. Lottspeich, Max-Planck-Institut für Biochemie, D-82152 Martinsried, Germany.