[1] The Sainsbury Laboratory, University of East Anglia, Norwich Research Park, Norwich,NR4 7UH, United Kingdom
[2] Key Laboratory of RNA Biology, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing,100101, China
[3] National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing,100101, China
[4] University of Chinese Academy of Sciences, Beijing,100049, China
[5] Institute of Integrative Genome Biology, University of California Riverside, CA,92521, United States
[6] School of Agriculture & Biology, Shanghai Jiaotong University, Shanghai,200240, China