1. Graduate research assistant, Department of Food Science and Human Nutrition, Iowa State University, Ames.
2. Professor, Department of Food Science and Human Nutrition, and Professor-in-Charge, Center for Crops Utilization Research, Iowa State University, Ames, IA 50011. Corresponding author. E-mail: ljohnson@iastate.edu
3. Research geneticist, USDA-ARS, Dept. of Agronomy, Iowa State University, Ames.
4. Laboratory research technician, Center for Crops Utilization Research, Iowa State University, Ames.
5. Professor, Department of Statistics, Iowa State University, Ames.