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Predicted residual DNA DSBs per cell as a function of follow-up time for human lung fibroblasts (MRC-5 line) exposed briefly in culture to 90 kV x-rays: diamonds, 5 mGy; squares, 20 mGy; triangles, 100 mGy; circles, 200 mGy; horizontal dashed line, 0 mGy. Data points indicate where calculations were perform rather than actual measured data.
