1. Department
of Biochemistry, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106, United States
2. RIKEN Systems and Structural Biology Center, Yokohama, Japan
3. Division
of Structural and Synthetic Biology, RIKEN Center for Life Science Technologies, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan
4. Department
of Biochemistry and Molecular Biology, The Center of RNA Molecular
Biology, Pennsylvania State University, University Park, Pennsylvania 16802, United States
5. RIKEN Structural Biology Laboratory, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama 230-0045, Japan