1. Department of Chemistry − BMC, Uppsala University, SE-75123 Uppsala, Sweden
2. Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, SE-17165 Solna, Sweden
3. Department of Biology, Structural Biology and NMR Laboratory and the Linderstro̷m-Lang Centre for Protein Science, University of Copenhagen, DK-2200 Copenhagen, Denmark
4. Department of Cell and Molecular Biology, Uppsala University, SE-75124 Uppsala, Sweden