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V. cholerae flicking probability depends on the sodium motive force. Bivariate histograms of consecutive turning angles for sodium concentrations of 136 mM (a), 7.4 mM (b), and 1.8 mM (c), with respective average swimming speeds of 92, 37, and 23 μm/s. The sodium concentration for Fig. 1f is 181 mM, and the average swimming speed is 94 μm/s.
