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Exposure to radiation has been proposed to reduce levels of antioxidants that are used for DNA repair and this reduction may be responsible for increased levels of mutation in radioactively contaminated areas. We test this hypothesis using field measures of antioxidants in blood, liver and eggs of the barn swallow<jats:italic>Hirundo rustica<\/jats:italic>while relating these to levels of mutation as reflected by the frequency of abnormal sperm. Antioxidant levels in blood, liver and eggs were reduced in Chernobyl, Ukraine, compared with an uncontaminated control area, and levels of antioxidants correlated negatively with levels of background radiation. The frequency of abnormal sperm was almost an order of magnitude higher in Chernobyl than in the control area and was negatively related to antioxidant levels in blood and liver. This is consistent with the hypothesis of a direct link between radiation and individual levels of antioxidants, suggesting that levels of mutation differ among individuals owing to individual differences in the abundance of antioxidants.<\/jats:p>","DOI":"10.1098\/rspb.2004.2914","type":"journal-article","created":{"date-parts":[[2005,2,10]],"date-time":"2005-02-10T22:39:17Z","timestamp":1108075157000},"page":"247-253","source":"Crossref","is-referenced-by-count":66,"title":["Antioxidants, radiation and mutation as revealed by sperm abnormality in barn swallows from Chernobyl"],"prefix":"10.1098","volume":"272","author":[{"given":"A. 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