Biological contamination

synthetic nucleic acid (eight nucleobases — four natural, and four synthetic)

pathogen that can be weaponized

controversial term for uncontrolled dispersal of contaminated altered genes from genetically engineered organisms to natural organisms

guiding principle in the design of an interplanetary mission, aiming to prevent biological contamination of both the target celestial body and the Earth

biological contamination of a planetary body by a space probe or spacecraft

thumb|280px|right|Researchers working in Biosafety level#Biosafety level 3|Class III cabinets at the [[U.S. Army Biological Warfare Laboratories, Camp Detrick, Maryland (1940s). Biocontainment procedures were pioneered at the USBWL in the 1940s and '50s.]]