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. Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
4. Department of Biochemistry and Molecular Biology, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
5. Laboratoire International Associé Centre National de la Recherche Scientifique et University of Illinois at Urbana−Champaign, Unité Mixte de Recherche n 7019, Université de Lorraine, BP 70239, 54506 Vandœuvre-lès-Nancy cedex, France
6. Department of Physics, University of Illinois, Urbana, Illinois 61801, United States
7. Department of Chemistry, University of Bergen, N-5020 Bergen, Norway