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Responses to the artificial oxygen gradient of wild-type and mutant tethered cells. (A) R. sphaeroides WS8N; (B) SR4 (ΔprrBCA); (C) SR11 (ΔprrB); (D) JPA441 (ΔcheOp1 ΔcheOp2 ΔcheY4 ΔcheY5); (E) JPA211 (ΔcheA2). The arrow shows when the gradient starts. The upper trace shows the change in oxygen concentration over time. The concentration of oxygen was changed at 0.4 μM/s (0.2 DOT/s).
