Department of Genetics, Exc3xb6tvxc3xb6s Lorxc3xa1nd University, Pxc3xa1zmxc3xa1ny Pxc3xa9ter sxc3xa9txc3xa1ny 1/C, 1117 Budapest, Chemistry Doctoral School, University of Szeged, Dugonics txc3xa9r 13, 6720 Szeged, Department of Biochemistry, Exc3xb6tvxc3xb6s Lorxc3xa1nd University, Pxc3xa1zmxc3xa1ny Pxc3xa9ter sxc3xa9txc3xa1ny 1/C, 1117 Budapest, Hungary, Uppsala Center for Computational Chemistry, Science for Life Laboratory, Department of Cell and Molecular Biology, University of Uppsala, Box 596, SE-75124 Uppsala, Sweden, and MTA-ELTE Molecular Biophysics Research Group, Hungarian Academy of Sciences, Pxc3xa1zmxc3xa1ny sxc3xa9txc3xa1ny 1/C, 1117 Budapest, Hungary.