1. Gene Center Munich and Center for Integrated Protein Science, Department of Chemistry and Biochemistry, Ludwig-Maximilians-Universität München, Feodor-Lynen-Strasse 25, 81377 Munich, Germany.
2. Departamento de Bioquímica, Instituto de Fisiología Celular, Circuito Exterior s/n, Ciudad Universitaria, Universidad Nacional Autónoma de México, Mexico, Distrito Federal, 04510, Mexico.
3. Institut de Biologie Moléculaire et Cellulaire du CNRS, Architecture et Réactivité de l’ARN, Université de Strasbourg, 15 rue René Descartes, F-67084 Strasbourg, France.
4. Department of Physics, Beckman Institute, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
5. Ultrastrukturnetzwerk, Max Planck Institute for Molecular Genetics, Ihnestrasse 63-73, D-14195 Berlin, Germany.
6. Institut für Medizinische Physik und Biophysik, Charite–Universitätsmedizin Berlin, Ziegelstrasse 5-9, 10117-Berlin, Germany.
7. Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, 364 Plantation Street, Worcester, MA 01605, USA.