College of Animal Science and Veterinary Medicine,Agricultural University of Hebei,Baoding 071001,China;
College of Animal Science and Veterinary Medicine,Agricultural University of Hebei,Baoding 071001,China;
College of Traditional Chinese Veterinary Medicine,Agricultural University of Hebei,Dingzhou 073000,China;
College of Animal Science and Veterinary Medicine,Agricultural University of Hebei,Baoding 071001,China;
College of Animal Science and Veterinary Medicine,Agricultural University of Hebei,Baoding 071001,China;
transmissible gastroenteritis virus; N gene; cloning; expression;