1. Faculty of Life Sciences, Kyoto Sangyo University and Institute for Protein Dynamics , Kamigamo, Motoyama, Kita-ku, Kyoto 603-8555, Japan
2. Department of Experimental Medical Science, Lund University , 221 00 Lund , Sweden
3. Department of Molecular Biology, Umeå University, Building 6K, 6L University Hospital Area, 90187 Umeå , Sweden
4. Department of Biochemistry and Molecular Biology, Center for RNA Molecular Biology, Pennsylvania State University, University Park , PA , USA
5. Department of Chemistry and Chemical Biology, Harvard University , Cambridge , MA , USA
6. University of Tartu, Institute of Technology, 50411 , Tartu , Estonia