1. University of Rome Tor Vergata, Department of Biology, Rome, Italy.
2. Centro de Astrobiología (CAB), CSIC-INTA, Department of Molecular Evolution, Torrejón de Ardoz, Madrid, Spain.
3. German Aerospace Center (DLR), Institute of Planetary Research, Planetary Laboratories Department, Berlin, Germany.
4. German Aerospace Center (DLR), Institute of Aerospace Medicine, Radiation Biology Department, Cologne, Germany.
5. German Aerospace Center (DLR), Space Operations and Astronaut Training, Microgravity User Support Center, Cologne, Germany.