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β-Galactosidase analysis of aerobic, semiaerobic, and anaerobic photosynthetic cytochrome cbb3 oxidase gene expression patterns in the wild-type parent strain SB1003 and various regulatory mutants as indicated below each bar. The values represent averages of at least three independent assays. Units of activity refer to the number of micromoles of o-nitrophenyl-β-d-galactopyranoside hydrolyzed per minute per milligram of protein.
