1. Laboratory of Protein Structure, International Institute of Molecular and Cell Biology, Trojdena 4, Warsaw 02-109, Poland
2. Laboratory of RNA Biology and Functional Genomics, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawinskiego 5a, Warsaw 02-106, Poland
3. Laboratory of RNA Biology, International Institute of Molecular and Cell Biology, Trojdena 4, Warsaw 02-109, Poland
4. Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawinskiego 5a, Warsaw 02-106, Poland
5. Structural Biology Center, International Institute of Molecular and Cell Biology, Trojdena 4, Warsaw 02-109, Poland
6. Institute of Genetics and Biotechnology, Faculty of Biology, University of Warsaw, Pawinskiego 5a, Warsaw 02-106, Poland