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β-Galactosidase activity measurement of puf::lacZ reporter gene plasmid pCB532Ω in strains SB1003, SD01, SD01-M52, and SD01-M08 (see the legend to Fig. 6 for strain genotypes). Cells were grown either aerobically (open bars) or anaerobically (solid bars), and β-galactosidase activities were then measured as described in the legend to Fig. 3.
