1. Institute for Biochemistry, Leipzig University, Brüderstrasse 34, 04103 Leipzig, Germany
2. Architecture et Réactivité de l’ARN, Université de Strasbourg, CNRS, IBMC, 67084 Strasbourg, France
3. Institute of Molecular Biosciences, Goethe-University and Center of Biomolecular Magnetic Resonance (BMRZ), Frankfurt/M., Max-von-Laue-Strasse 9, 60438, Frankfurt, Germany