Chien-An A Hu1, Zhenlong Wu2, Junjun Wang2. 1. Department of Biochemistry and Molecular Biology, University of New Mexico, Health Sciences Center, Albuquerque, NM, 87131-0001, USA. ahu@salud.unm.edu. 2. State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, People's Republic of China.