Abstract
Normal and ataxia telangiectasia (AT) human cells were exposed to 10(-5) mole/liter bromodeoxyuridine (BrdUrd) or iododeoxyuridine (IdUrd). High-pressure liquid chromatography (HPLC) measurements showed that up to 26 and 23% of the thymidine in DNA was substituted by BrdUrd in normal and AT cells, respectively. The incorporation of BrdUrd or IdUrd into DNA resulted in radiosensitization in normal and AT cells. When exposed to equal concentrations of BrdUrd and IdUrd, the BrdUrd caused greater radiosensitization than IdUrd in both normal and AT cells.
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