1. Department of Biochemistry II; Jena University Hospital, Friedrich Schiller University Jena; Jena Germany
2. Institute of Physiological Chemistry, University Hospital Halle; Martin Luther University Halle-Wittenberg; Halle/Saale Germany
3. Helmholtz Protein Sample Production Facility; Max-Delbrück-Center for Molecular Medicine; Berlin Germany
4. Crystallography; Max Delbrück Center for Molecular Medicine; Berlin Germany
5. Chemistry and Biochemistry Institute; Freie Universität Berlin; Berlin Germany