A type of unstable molecule that contains oxygen and that easily reacts with other molecules in a cell. A build up of reactive oxygen species in cells may cause damage to DNA, RNA, and proteins, and may cause cell death. Reactive oxygen species are free radicals. Also called oxygen radical.
( ree-AK-tive OK-sih-jen SPEE-sees )
Source: NCI Dictionary of Cancer Terms
Search the Glossary of Medical Terms
Newsletter
Sign up for the QuackTrack.org newsletter below!