1. College of Computer Science and Technology, Jilin University, Changchun 130012, China
2. Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education, Jilin University, Changchun 130012, China
3. College of Software, Jilin University, Changchun 130012, China
4. College of Plant Science, Key Laboratory of Zoonosis Research, Ministry of Education, Jilin University, Changchun 130012, China
5. Department of Molecular Microbiology and Immunology, School of Medicine, University of Missouri, Columbia, MI 65211-7310, USA