1. European Molecular Biology Laboratory Meyerhofstr.1 69117 Heidelberg Germany
2. Biocentre, Departments of Biology and Chemistry Johannes Gutenberg-University Mainz Hanns-Dieter-Hüsch-Weg 17 55128 Mainz Germany
3. Institute of Molecular Biology Ackermannweg 4 55128 Mainz Germany
4. ARAXA Biosciences GmbH Meyerhofstraße 1 69117 Heidelberg Germany
5. Cellzome GmbH GlaxoSmithKline Meyerhofstrasse 1 69117 Heidelberg Germany
6. Department of Chemical Physiology and Biochemistry Oregon Health & Science University (OHSU) Portland Oregon 97239-3098 USA