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Colony-forming assay following exposure of cells to 137Cs γ-rays. The proportion (%) of surviving colonies was plotted against dose of γ-rays for normal TERT-immortalised cells, TERT-immortalised skin fibroblasts from patient A-T213 and TERT-immortalised fibroblasts from a classical A-T patient A-T1BR. The assay was repeated at least three times for each cell strain. Error bars show the s.e.m. survival at each dose.
