[1] Ohio State Univ, Dept Mol & Cellular Biochem, Columbus, OH 43210 USA
[2] Ohio State Univ, Ctr RNA Biol, Columbus, OH 43210 USA
[3] Univ Rochester, Dept Biochem & Biophys, Rochester, NY 14642 USA
[4] Univ Rochester, Ctr RNA Biol, Rochester, NY 14642 USA