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Chemotactic responses of the classical strain of V. cholerae and its Δmlp24 mutant toward amino acids indicated in each panel. Closed circles, O395N1; open circles, Δmlp24. Relative chemotaxis index is defined as a ratio of the number of bacteria in the capillary of interest to that in the control capillary filled with buffer in each set of experiments. Standard errors of triplicate data for each concentration are shown.
