1. Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Tai'an 271018, Shandong, People's Republic of China;
2. Henan Engineering Laboratory for Mammary Bioreactor, School of Life Sciences, Henan University, Kaifeng 475004, Henan, People's Republic of China;
3. Division of Clinical Immunology and Transfusion Medicine, Department of Laboratory Medicine, Karolinska Institutet at Karolinska Hospital Huddinge, Karolinska University Hospital Huddinge, SE-141 86 Stockholm, Sweden;
4. State Key Laboratory of Agrobiotechnology, College of Biological Sciences, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing 100193, People's Republic of China;