1. Protein
Crystallography Group, Leibniz Institute for Age Research-Fritz Lipmann Institute (FLI), Beutenbergstr. 11, 07745 Jena, Germany
2. Department
of Pharmaceutical Chemistry, Philipps University Marburg, Marbacher Weg
6, D-35032 Marburg, Germany
3. Department
of Molecular Biology, University of Salzburg, Billrothstrasse 11, A-5020 Salzburg, Austria