1. Division of Pharmaceutical
Biology, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland
2. Institute of Anatomy and Cell Biology, Justus-Liebig-University, Aulweg 123, D-35385 Giessen, Germany
3. Deutsches Zentrum für Lungenforschung (DZL), Aulweg 130, D-35392 Giessen, Germany