1. Wisconsin Energy Institute, Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, Wisconsin, USA
2. Laboratory of Genetics, University of Wisconsin-Madison, Madison, Wisconsin, USA
3. Department of Biochemistry, University of Wisconsin-Madison, Madison, Wisconsin, USA
4. Cryo-Electron Microscopy Research Center,Department of Biochemistry, University of Wisconsin-Madison, Madison, Wisconsin, USA
5. Midwest Center for Cryo-Electron Tomography, Department of Biochemistry, University of Wisconsin-Madison, Madison, Wisconsin, USA
6. Department of Civil and Environmental Engineering, University of Wisconsin-Madison, Madison, Wisconsin, USA
7. Department of Bacteriology, University of Wisconsin-Madison, Madison, Wisconsin, USA