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Colony survival assay. Clonogenic survival curves are shown for Chinese hamster cell lines, wild-type V79 and AA8 (panel A), HR-deficient irs1 and irs1SF (panel B). NHEJ-deficient XR1 and V3 (panel C) after irradiation with γ rays or 200 MeV protons and 290 MeV C ions with 6 cm SOBP. The curves were fitted by LQ model and the error bars represent SD.
