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Home >Information for Patients > Dictionary Index
Dictionary of Cancer Terms
View in Spanish: Radical libre
Free radical
A highly reactive chemical that often contains oxygen and is produced when molecules are split to give products that have unpaired electrons (a process called oxidation). Free radicals can damage important cellular molecules such as DNA or lipids or other parts of the cell.
Source: National Cancer Institute Dictionary of Cancer Terms, available at www.cancer.gov/dictionary.
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22 S. Greene Street, Baltimore, MD 21201
22 S. Greene Street, Baltimore, MD 21201
