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- ArticleSheridan RB, Huang PC.Mutat Res. 1978 Oct;52(1):129-36.The possibility that the increased sensitivity of ataxia telangiectasia towards ionizing radiation is related to a DNA-repair deficiency has been examined further. When compared to unaffected controls, 6 lines of fibroblast cells derived from ataxia patients demonstrated a slightly reduced endonucleolytic activity (165 +/- 12 units vs. 214 +/- 28 units) towards apurinic and/or apyrimidinic sites as determined in a "nicking" assay.