1. Department of Chemistry, Iowa State University, Ames, Iowa 50011
2. Ames Laboratory-United States Department of Energy, Ames, Iowa 50011
3. Roy J. Carver Department of Biochemistry, Biophysics, and Molecular Biology, Iowa State University, Ames, Iowa 50011
4. Center for Metabolic Biology, Iowa State University, Ames, Iowa 50011
5. Department of Genetics, Development, and Cell Biology, Iowa State University, Ames, Iowa 50011