1. Aix Marseille Université, CNRS, BIP (UMR 7281), Marseille, France
2. EMMAH (UMR 1114), INRA, Avignon, France
3. Aix Marseille Université, CINaM (UMR 7325), Luminy, France
4. Carl R. Woese Institute for Genomic Biology, and Department of Physics, University of Illinois, Urbana, IL 61801, USA
5. NASA Astrobiology Institute, Ames Research Center, CA, USA