1. Department of Biological Sciences, University of Bergen, N-5020 Bergen, Norway
2. Computational Biology Unit, Department of Informatics, University of Bergen, N-5020 Bergen, Norway
3. Groningen Biomolecular Sciences and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 7, 9747 AG Groningen, Netherlands
4. Department of Chemistry, University of Bergen, N-5020 Bergen, Norway