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Induction of apoptosis (relative to untreated controls) by X-ray (open circles) or 12C6+ irradiation in the plateau region (filled diamonds) or in the extended Bragg peak (filled squares) under ambient or hypoxic oxygen supply conditions [modified according to Ref. (7)]. (A) At an external pO2 of 144 mm Hg and (B) at an external pO2 of 0 mm Hg.
