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- ArticleRedpath JL, Tortorello ML.Int J Radiat Biol Relat Stud Phys Chem Med. 1977 Nov;32(5):465-9.8-Methoxypsoralen has been shown to act as a radiosensitizer of hypoxic bacterial cells with uvrA, recA and uvrB and/or lexA mutations. No effect of the drug on the radiosensitivity of oxic bacteria with these mutations was observed. This drug differs from O2 and electron-affinic radiosensitizers in that its effect is not purely dose-modifying and can exceed the oxygen effect in certain mutants.