1. Roy J. Carver Department of Biochemistry, Biophysics, and Molecular Biology, Iowa State University, Ames, Iowa 50011, United States
2. Engineering Research Center for Biorenewable Chemicals, Iowa State University, Ames, Iowa 50011, United States
3. Center for Metabolic Biology, Iowa State University, Ames, Iowa 50011, United States
4. Department of Genetics, Development, and Cell Biology, Iowa State University, Ames, Iowa 50011, United States