1. MOE Key Laboratory of Industrial Biocatalysis, Institute of Biochemical Engineering; Department of Chemical Engineering; Tsinghua University; Beijing 100084 P. R. China
2. Bio-Cell Co. Ltd.; Beijing 100085 P. R. China
3. Centre for Synthetic and Systems Biology; Tsinghua University; Beijing 100084 P. R. China
4. Institute of Virology Disease Control; Chinese Center for Disease Control and Prevention; Beijing 102206 China