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(A) Organization of the cheOp1 locus of R. sphaeroides. The arrows represent genes and their direction of transcription. (B) Phenotypic analysis of the cheOp1 mutants in the fla1− fla2+ genetic background. Soft agar motility assays were carried out in 0.25% agar supplemented with 100 μM succinate. Cells were grown under aerobic conditions at 30°C for 48 h.
