1. Department of Geology, University of Illinois Urbana-Champaign, Urbana, IL, USA
2. Carl R. Woese Institute for Genomic Biology, University of Illinois Urbana-Champaign, Urbana, IL, USA
3. Biosciences Division, Argonne National Laboratory, Argonne, IL, USA
4. Institute of Chemical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria
5. Illinois State Geology Survey, University of Illinois Urbana-Champaign, Champaign, IL, USA
6. Department of Microbiology, University of Illinois Urbana-Champaign, Urbana, IL, USA
7. Department of Biochemistry, University of Illinois Urbana-Champaign, Champaign, IL, USA