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Induction of DSBs and oxidized pyrimidine clusters in human cells by low doses of 1 GeV/atomic mass unit Fe26+ nuclei, normalized to the average frequency obtained for DSBs at 0.35 Gy (taken as 100%). Symbols: small, individual data (● and ♦, DSBs; ▴ and ▾, net Nth protein (oxidized pyrimidine) clusters; large, averages (○, DSBs; □, net oxidized pyrimidine clusters). Least-squares lines are shown.
