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Clonogenic survival of FSC (close circles) and T53 cells (closed squares) following in vivo irradiation. F2–F3 tumors were exposed to 20 Gy irradiation under uniform (clamp) hypoxic conditions. At 24, 96 and 288 hours following irradiation, the tumors were excised; a single cell suspension was prepared, counted, and plated for colony formation. The surviving fraction data is normalized against control (unirradiated) tumors. Confidence intervals are one standard deviation.
