1. Department of Molecular Biology, Maria Curie-Sklodowska University, Akademicka 19, 20-033 Lublin, Poland
2. European Molecular Biology Laboratory, Hamburg Outstation, Notkestrasse 85, 22603 Hamburg, Germany
3. Max-Planck Karl Bonhoeffer Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
4. Gene Center, Department of Biochemistry, Ludwig-Maximilians-Universität München, Feodor-Lynen-Strasse 25, 81377 Munich, Germany