1. Department of Biochemistry, Biophysics, and Molecular Biology, Iowa State University, Ames, Iowa 50011 (H.C., M.G.J., A.M.M.)
2. ExSeed Genetics, L.L.C., and Department of Agronomy, Food Sciences Building, Iowa State University, Ames, Iowa 50011 (J.I.-P., H.G., P.L.K.)