Abstract
1 Center for Agricultural Biotechnology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China
2 California Pacific Medical Center Research Institute, San Francisco, CA 94107, USA
3 Bureau of Animal Husbandry and Fishery of Xiangxiang, Xiangxiang 411400, PR China
4 Laboratory of Structural Biology, School of Life Sciences and Bio-Engineering, Tsinghua University, Beijing 100084, PR China
5 Hebei Academy of Agricultural Sciences, Baoding 071000, PR China