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Reactive oxygen species
Pronunciation
Definition 1
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. (NCI Dictionary)
Definition 2
Organic or inorganic chemicals that contain an oxygen atom with an unpaired electron. This unstable electron configuration causes these chemicals to be highly reactive with other molecules. (NCI Thesaurus)
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