1. SETI Institute, Mountain View, California, USA.
2. NASA HQ, Washington, District of Columbia, USA.
3. Department of Biology, Penn. State University (Altoona), Altoona, Pennsylvania, USA.
4. Jet Propulsion Laboratory/California Institute of Technology, Pasadena, California, USA.
5. NASA Johnson Space Center, Houston, Texas, USA.
6. NASA Ames Research Center, Moffett Field, California, USA.
7. School of Medicine, University of California, Davis, Davis, California, USA.
8. LESIA, Paris Observatory-PSL University, CNRS, Meudon, France.
9. Department of Geology & Geophysics, Louisiana State University, Baton Rouge, Louisiana, USA.
10. Council on Foreign Relations, Washington, District of Columbia, USA.
11. The Aerospace Corp., Houston, Texas, USA.
12. College of William & Mary, Williamsburg, Virginia, USA.
13. NASA Goddard Space Flight Center, Greenbelt, Maryland, USA.
14. School of Geoscience, University of Aberdeen, Aberdeen, United Kingdom.
15. Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Armilla, Spain.
16. California Polytechnic (Pomona), Pomona, California, USA.
17. School of Environment, Earth and Ecosystem Sciences, Open University, Milton Keynes, United Kingdom.
18. European Space Agency, Paris, France.
19. Department of Applied Sciences, Northumbria University, Newcastle Upon Tyne, United Kingdom.
20. DLR (Cologne), Cologne, Germany.
21. Friday Harbor Associates LLC, Friday Harbor, Washington, USA.
22. Department of Plant Pathology, University of Florida, Merritt Island, Florida, USA.
23. US Department of Health & Human Services, Washington, District of Columbia, USA.
24. Symbiotek Systems, Santa Cruz, California, USA.
25. Centro de Astrobiología (CAB), CSIC-INTA, Madrid, Spain.