1. State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College, Tsinghua University, Beijing 100005, P. R. China.
2. State Key Laboratory for Molecular Virology and Genetic Engineering, National Institute for Viral Disease Control and Prevention, China CDC, Changbai 155, Changping District, Beijing 102206, China.
3. Genetic Engineering Laboratory, Institute of Military Veterinary, Academy of Military Medical Sciences, Changchun 130062, China.
4. MOE Key Laboratory of Model Animal for Disease Study, Model Animal Research Center of Nanjing University, 22 Hankou Road, Nanjing 210093, China.
5. Peking Union Medical College Hospital, No.1 Shuaifuyuan, Beijing 100005, China.
6. Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.