1. Institute of Biochemistry, Eidgenössische Technische Hochschule Zürich 1 , Zurich, Switzerland
2. CRBM, Université de Montpellier 2 , CNRS, Montpellier, France
3. Eidgenössische Technische Hochschule Zürich 3 Department of Biosystems Science and Engineering, , , Basel, Switzerland
4. and Swiss Institute of Bioinformatics 3 Department of Biosystems Science and Engineering, , , Basel, Switzerland
5. Laboratory of Biomolecular Research, Paul Scherrer Institute 4 Department of Biology and Chemistry, , Villigen, Switzerland
6. 6Laboratory of Biology, University of Ioannina, Faculty of Medicine, Ioannina, Greece
7. University of Basel, Biozentrum 5 , Basel, Switzerland