The stowaways.
Clarke
T
T
D000255:Adenosine Triphosphate / Q000378:metabolism; D001419:Bacteria; D018534:Earth, Planet; D004783:Environmental Microbiology; D018559:Exobiology; D005118:Extraterrestrial Environment; D008156:Luciferases / Q000378:metabolism; D018535:Mars; D008828:Microbiological Techniques; D013055:Spectrophotometry, Infrared; D013242:Sterilization; D014867:Water
D014867:Water; D000255:Adenosine Triphosphate; D008156:Luciferases