Abstract
SummaryMouse L-60 cells were irradiated in O2 or N2 atmospheres, and DNA single-strand breaks were measured using alkaline sucrose gradients. It was found that the presence of oxygen increased the yield of single-strand breaks. The oxygen enhancement ratio (OER) was 2·9, a value comparable to the OER for its colony-forming ability in L-60 cells. This observation was made using two different sedimentation techniques.
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