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Effect of Fe on activation of inaA::lacZ by 2,2"-dipyridyl. The mar sox rob+ inaA::lacZ strain N7969 was treated with the indicated concentrations of 2,2"-dipyridyl (▪) or 2,2"-dipyridyl plus equimolar FeSO4 (○) for 1 h in LB broth and assayed for β-galactosidase (Miller units).
