NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,235 terms related to cancer and medicine.
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- oxygen radical
- listen (OK-sih-jen RA-dih-kul)
- A type of unstable molecule that contains oxygen and that easily reacts with other molecules in a cell. A build up of oxygen radicals in cells may cause damage to DNA, RNA, and proteins, and may cause cell death. An oxygen radical is a free radical. Also called reactive oxygen species.