1. College of Veterinary Medicine, Jilin Agricultural University, Changchun, China.
2. Jilin Provincial Engineering Research Center of Animal Probiotics, Jilin Agricultural University, Changchun, China.
3. Department of Cell Biology and Anatomy, University of South Carolina School of Medicine, Columbia, South Carolina, USA.
4. Division of Basic Biomedical Sciences, The University of South Dakota Sanford School of Medicine, Vermillion, South Dakota, USA.