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Relative activities of rrnB P2 promoter variants. β-Galactosidase activities from single-copy rrnB P2 promoter-lacZ fusions were measured in M9 minimal medium containing 0.4% glycerol as a carbon source. The rrnB P2(−68 to +7; C+5G,C+7G) fusion is the construct reported in reference 12. The average and standard deviation of at least three independent experiments are shown for each promoter.
