1. Microbiology Department, University of Massachusetts, Amherst, Massachusetts, USA
2. Microbial Communities Group, Joint BioEnergy Institute, Emeryville, California, USA
3. Ecology Department, Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA
4. Department of Environmental Science, Policy and Management, University of California—Berkeley, Berkeley, California, USA
5. Biomass Sciences and Conversion Technology Department, Sandia National Laboratories, Livermore, California, USA
6. Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, Tennessee, USA
7. Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA