1. College of Food Science and EngineeringOcean University of China Qingdao 266003 China
2. Produce Safety and Microbiology Research Unit, United States Department of AgricultureAgriculture Research Service Albany CA 94706 USA
3. Diet, Genomics, and Immunology Laboratory, Beltsville Human Nutrition Research Center, United States Department of AgricultureAgriculture Research Service Beltsville MD 20705 USA
4. Animal Genomics and Improvement LaboratoryUnited States Department of AgricultureAgriculture Research Service Beltsville MD 20705 USA