About the Authors
Center for Structural Biology, School of Life Sciences, Ministry of Education Key Laboratory of Protein Sciences, Tsinghua University, Beijing, People's Republic of China
School of Medicine, Tsinghua University, Beijing, People's Republic of China
State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, People's Republic of China
The authors have declared that no competing interests exist.
Conceived and designed the experiments: XW. Performed the experiments: XX QL HW DW DC GH. Analyzed the data: XX QL HW DW DC GH. Contributed reagents/materials/analysis tools: LH HW. Wrote the paper: XX QL DW XW.