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Implication of three SODs in low-iron and/or superoxide stress conditions. The logarithmic-phase bacterial cells tested were collected, adjusted to a concentration of 2 × 105 CFU/µL, and 10-fold serially diluted. Then 5 µL of bacterial cells was spotted onto the LB agar (LA) containing 10 μg/mL MD and/or 30 μg/mL iron chelator 2,2-dipyridyl (DIP). After 24 h of incubation at 37 °C, the growth of bacterial cells was observed.
