1. Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University, Changchun 130012, People's Republic of China
2. School of Life Sciences, Jilin University, Changchun 130012, People's Republic of China
3. National Engineering Laboratory for AIDS Vaccine, School of Life Sciences, Jilin University, Changchun 130012, People's Republic of China
4. Institute of Changbai Mountain Resource and Health, Jilin University, Fusong 134504, People's Republic of China