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The strains MB120-5A (WT), MB121- pif1Δ, MB161B- dna2Δ pif1Δ, MB122-17C- mre11Δ, MB124-2D- mre11Δ pif1Δ were harvested in mid-log phase, resuspended in water, irradiated, serially diluted (1∶10), and plated.
