1. CNRS, IBGC, University of Bordeaux, UMR 5095 , F-33000 Bordeaux, France
2. Institute of Biochemistry and Biophysics, Polish Academy of Sciences , 01-224 Warsaw, Poland
3. UPR ‘Architecture et Réactivité de l’ARN’, CNRS, Institut de Biologie Moléculaire et Cellulaire, Université de Strasbourg , F-67084 Strasbourg Cedex, France
4. Department of Biochemistry and Molecular Biology, Wayne State University School of Medicine , Detroit, MI 48202, USA
5. European Molecular Biology Laboratory (EMBL), Genome Biology Unit , 69117 Heidelberg, Germany
6. Department of Genetics, Stanford University School of Medicine , Stanford, CA 94305, USA
7. Stanford Genome Technology Center , Palo Alto, CA 94304, USA