1. Centre for Structural Systems Biology (CSSB), DESY and European Molecular Biology Laboratory Hamburg, Notkestrasse 85, D-22607 Hamburg, Germany
2. Structural Biology Brussels, Vrije Universiteit Brussel (VUB), Brussels 1050, Belgium
3. VIB-VUB Center for Structural Biology, VIB, Brussels 1050, Belgium
4. Structural and Computational Biology Unit, European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany
5. Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Scheeles väg 2, SE-17177 Stockholm, Sweden
6. Department of Molecular Biology and Genetics − DANDRITE, Gustav Wieds Vej 10, Aarhus University, DK-8000 Aarhus C, Denmark