Chinese Academy of Sciences Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100190, Peoples Republic of China. liuxueting_cn@hotmail.com.|Chinese Academy of Sciences Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100190, Peoples Republic of China. liuxueting_cn@hotmail.com.|Chinese Academy of Sciences Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100190, Peoples Republic of China. liuxueting_cn@hotmail.com.|Chinese Academy of Sciences Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100190, Peoples Republic of China. liuxueting_cn@hotmail.com.|Department of Computer Science, KAIST, 291 Daehak-ro, Daejeon, Republic of Korea. park@cs.kaist.ac.kr.