1. Department of Food Science, North Carolina State University, Raleigh, North Carolina 27695-7624, Fonterra Research Center, Private Bat 11 029, Dairy Farm Road, Palmerston North, New Zealand, and Centre de recherche STELA, Departement de Sciences des Aliments et de Nutrition, Pavillon Paul-Comtois, Université Laval, Québec, Canada G1K 7P4