1. Department of Earth and Environmental Sciences, Michigan State University, East Lansing, Michigan, USA
2. Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, USA
3. Department of Earth and Environmental Sciences, University of Minnesota—Twin Cities, Minneapolis, Minnesota, USA
4. BioTechnology Institute, University of Minnesota—Twin Cities, St. Paul, Minnesota, USA
5. Department of Biology, University of Utah, Salt Lake City, Utah, USA
6. SETI Institute, Mountain View, California, USA
7. Exobiology Branch, NASA Ames Research Center, Moffett Field, California, USA
8. Laboratory for Atmospheric and Space Physics, UCB 600, University of Colorado—Boulder, Boulder, Colorado, USA
9. Department of Geosciences, University of Rhode Island, Kingston, Rhode Island, USA