AUTHOR CONTRIBUTIONS
Shuai Li, Xinyang Tan, Zhen He and Rui Ji conceived the project,
performed the experiments, analyzed the data, and wrote the manuscript.
Rui Ji, Jichao Fang, Ary A. Hoffmann, and Chunqing Zhao supervised the
project and edited the English language. Yali Li, Liu Yang and Lei Jiang
helped in the sequencing data handling and arrangement. All authors read
and approved the final manuscript.