1. Faculty of Biochemistry and Molecular Medicine and Biocenter Oulu, University of Oulu, Oulu, Finland
2. Department of Biochemistry and Molecular Genetics, University of Virginia, PO Box 800577, Charlottesville, VA 22908, U.S.A.
3. Department of Structural Biology, Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Berlin, Deutschland