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β-Galactosidase values under aerobic (A) and anaerobic (B) conditions of growth. Strains contain the puf::lacZ and puc::lacZ transcriptional fusions in pUI1663 and pCF200Km, respectively, in trans. Experiments were performed in duplicate, and standard deviations were ≤20%. Filled bars represent the puc::lacZ fusion; open bars represent the puf::lacZ fusion. β-Galactosidase values are expressed in micromoles per minute per milligram of protein.
