1. Institute of Pharmaceutical ChemistryPhilipps University Marbacher Weg 6 35032 Marburg Germany
2. Institute of VirologyPhilipps University Hans-Meerwein-Str. 2 35043 Marburg Germany
3. Department of Lung Development and RemodellingMax Planck Institute for Heart and Lung Research Bad Nauheim Germany
4. Department of Anatomy and NeurobiologyUniversity of Maryland Medical School Baltimore MD 21201 USA
5. Protein Crystallography GroupLeibniz Institute on Aging—Fritz Lipmann Institute Beutenbergstr. 11 07745 Jena Germany
6. Department of BiosciencesUniversity of Salzburg Billrothstrasse 11 5020 Salzburg Austria