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Kinetics of repair of DNA strand breaks in E. coli BW544 and BH110 pretreated with 1 mM dipyridyl for 20 min and then treated with 5 mM H2O2 for 20 min. Cells were allowed to recover from DNA damage in M9S medium at 37°C with shaking for the indicated times. Values are means ± standard errors. ■, xthA nfo strain; ▵, xthA nfo fpg strain.
