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Quantitative real-time RT-PCR data showing OPN RNA expression under normoxic (N = 21 % O2) and hypoxic (H = 1 % O2 or 0.1 % O2) conditions 24 h after irradiation with 0, 2 and 8 Gy in Cal27 (a) and FaDu (b), (c) head and neck cancer cell lines
