title: Evaluating the evidence for past life on Mars.
authors.forename: C K
authors.initials: CK
authors.lastname: Shearer
authors.forename: J J
authors.initials: JJ
authors.lastname: Papike
mesh_terms: D018559:Exobiology; D005118:Extraterrestrial Environment; D007501:Iron / Q000737:chemistry*; D018535:Mars; D019110:Meteoroids; D013440:Sulfides / Q000737:chemistry*; D013455:Sulfur / Q000032:analysis; D013460:Sulfur Isotopes
chemical_list: D013440:Sulfides; D013460:Sulfur Isotopes; C011342:pyrite; D013455:Sulfur; D007501:Iron