1 Key Laboratory of Bioengineering & Biotechnology of State Ethnic Affairs Commission, Engineering & Technology Research Center for Animal Cell, Gansu, College of Life Science and Engineering, Northwest Minzu University, Lanzhou, China.
2 Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.
3 State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China.
4 Ministry of Education Key Laboratory of Molecular Microbiology and Technology, Nankai University, Tianjin, China.