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β-Galactosidase activities in R. sphaeroides strains containing the bchE::lacZ transcriptional fusion plasmid pBCHE. The wild-type (2.4.1) and prrCBA-minus (PRR) strains were grown aerobically (30% oxygen, black bars) to an OD600 of 0.3 to 0.4 or anaerobically in the dark with 0.5% DMSO (gray bars). All values are the averages of two independent determinations. Vertical bars represent the standard deviations from the mean.
