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Log10 of survival counts of exponential-phase cells of Escherichia coli MG1655 treated with 3 μg/mL (A) and 5 μg/mL (B) of kanamycin (•) and following the addition of 150 mM thiourea (▴) or 500 μM 2,2′-dipyridyl (▪). Cells were recovered in LB agar. Data are means ± standard deviations (error bars).
