1. Biophysical Chemistry, Center for Molecular Protein Science, Department of Chemistry, Lund University, P.O. Box 124, SE-22100 Lund, Sweden
2. Biochemistry and Structural Biology, Center for Molecular Protein Science, Department of Chemistry, Lund University, P.O. Box 124, SE-22100 Lund, Sweden
3. School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
4. Department of Science and Environment, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark