1. Department of Geosciences, Princeton University, Princeton, New Jersey, USA.
2. Division of Geological & Planetary Sciences, California Institute of Technology, Pasadena, California, USA.
3. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA.
4. Department of Earth Sciences, University of Southern California, Los Angeles, California, USA.
5. NASA Astrobiology Institute, Pasadena, California, USA.
6. Department of Biology, University of Southern Denmark, Odense, Denmark.
7. Department of Organismic & Evolutionary Biology, Harvard University, Cambridge, Massachusetts, USA.
8. Department of Earth Sciences, Uppsala University, Uppsala, Sweden.
9. Astromaterials Research and Exploration Science Division, NASA Johnson Space Center, Houston, Texas, USA.