1. School of Earth and Environmental Sciences, Washington State University, Pullman, Washington, USA.
2. Institut für Planetenforschung, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Berlin, Germany.
3. Planetary Habitability Laboratory, University of Puerto Rico at Arecibo, Arecibo, Puerto Rico, USA.
4. SETI Institute and NASA Ames Research Center, Moffett Field, California, USA.
5. Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona, USA.
6. Department of Earth and Space Sciences/Astrobiology Program, University of Washington, Seattle, Washington, USA.
7. Department of Biological Sciences, University of Texas at El Paso, El Paso, Texas, USA.