1. State Key Laboratory of Protein and Plant Gene Research; School of Life Sciences, Department of Chemical Biology and Synthetic and Functional Biomolecules Center; College of Chemistry and Molecular Engineering; Peking-Tsinghua Center for Life Sciences; Peking University; Beijing 100871 China
2. Academy for Advanced Interdisciplinary Studies; Peking University; Beijing 100871 China
3. Department of Chemistry; Department of Biochemistry and Molecular Biology; Institute for Biophysical Dynamics; Howard Hughes Medical Institute; The University of Chicago; 929 East 57th Street Chicago IL 60637 USA
4. Department of Chemical Biology and Synthetic and Functional Biomolecules Center; College of Chemistry and Molecular Engineering; Beijing Advanced Innovation Center for Genomics; Peking University; Beijing 100871 China