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recN, which is required for resistance to double-strand breaks, does not contribute to survival in the presence of DNA interstrand cross-links. The survival of wild type (WT) (▪), recA (▾), and recN (▿) mutants following UVA irradiation in the presence of (A) 40-μg/ml angelicin or (B) 10-μg/ml 8-methoxypsoralen is plotted. Plots represent the average of at least three experiments. Error bars represent SEM. Wild type from Figure 2 shown for comparison.
