1. Department of Microbiology, The Ohio State University, Columbus, Ohio, USA
2. The Center for RNA Biology, The Ohio State University, Columbus, Ohio, USA
3. Department of Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, New York, USA
4. National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, Maryland, USA
5. Howard Hughes Medical Institute, New York University School of Medicine, New York, New York, USA