About the Authors
Shanghai Jiaotong University, Shanghai, People's Republic of China
Shanghai Key Laboratory of Veterinary Medicine, Shanghai, People's Republic of China
Inner Mongolia Agricultural University, Hohhot, Inner Mongolia, People's Republic of China
The authors have declared that no competing interests exist.
Conceived and designed the experiments: CLY XGH. Performed the experiments: CLY CXZ YBW. Analyzed the data: CLY XYP. Contributed reagents/materials/analysis tools: XYP. Wrote the paper: CLY.