1. Department of Microbial Biotechnology; Centro Nacional de Biotecnología, CSIC; Darwin 3 28049 Madrid Spain
2. Department of Pharmacological Biochemistry; Laboratorios SALVAT S.A.; Barcelona Spain
3. Department of Molecular Microbiology and Biotechnology, George S. Wise Faculty of Life Sciences; Tel-Aviv University; Tel-Aviv 69978 Israel
4. Department of Biochemistry and Molecular Biology; South Denmark University; Odense M Denmark
5. Department of Protein Science; Centro de Investigaciones Biológicas, CSIC; Ramiro de Maeztu, 9 28040-Madrid Spain
6. Institute for Chemistry and Biochemistry/Crystallography; Freie Universität Berlin; Takustr. 6 D-14195 Berlin Germany
7. Institute of Food Research, Norwich Research Park; Norwich United Kingdom
8. Max Delbrück Center for Molecular Medicine Berlin-Buch; Robert-Roessle-Str. 10 D-13125 Berlin Germany
9. Swammerdam Institute for Life Sciences, University of Amsterdam; 1018 WV Amsterdam The Netherlands