title: The case for relic life on Mars.
authors.affiliation: National Aeronautics and Space Administration, Johnson Space Center, Houston, Tex., USA.
authors.forename: E K
authors.initials: EK
authors.lastname: Gibson
authors.forename: D S
authors.initials: DS
authors.lastname: McKay
authors.forename: K
authors.initials: K
authors.lastname: Thomas-Keprta
authors.forename: C S
authors.initials: CS
authors.lastname: Romanek
mesh_terms: D000864:Antarctic Regions; D002254:Carbonates / Q000032:analysis*; D004783:Environmental Microbiology; D019419:Evolution, Planetary; D018559:Exobiology; D005118:Extraterrestrial Environment; D005580:Fossils; D019015:Geologic Sediments / Q000032:analysis / Q000382:microbiology*; D018535:Mars; D019110:Meteoroids; D010103:Oxygen Isotopes; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis; D014867:Water / Q000032:analysis
chemical_list: D002254:Carbonates; D010103:Oxygen Isotopes; D011084:Polycyclic Aromatic Hydrocarbons; D014867:Water