1. Western Human Nutrition Research Center, Agricultural Research Service, US Department of Agriculture, Davis, California 95616
2. Department of Nutrition, University of California, Davis, California
3. Curriculum in Genetics and Molecular Biology, University of North Carolina at Chapel Hill, North Carolina
4. Nutrition Research Institute, University of North Carolina at Chapel Hill, Kannapolis, North Carolina
5. Department of Genetics, University of North Carolina at Chapel Hill, North Carolina
6. Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York