1. School of Life Science and Technology, Inner Mongolia University of Science & Technology, Baotou 014010, China.
2. Research and Development Center for Tissue Engineering, Xi'an 710048, China.
3. College of Veterinary Medicine, Northwest A&F University, Shenyang 712100, China.
4. Key Laboratory of Animal Reproductive Endocrinology & Embryo Engineering, Ministry of Agriculture, Shenyang 712100, China.