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Concentration–effect relation for a combination of psoralen and UV-366 nm (after 24 h preincubation of psoralen in FaDu cells). The longer the irradiation with UV-366 nm, the lower the cell survival fraction (SF). This effect was enhanced by adding psoralen. Without irradiation, there was no difference in survival for any psoralen concentration. The error bars show the SDpooled.
