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Chemotactic ability of strains that express various cheA alleles. Cells (5 μl) were spotted onto semisolid agar, and colony diameters were measured after 7 h of growth at 30°C. Grey bars indicate AJW689 (ΔcheA pAR1.cheA), white bars indicate AJW768 (ΔcheA pAR1.cheARV), black bars indicate AJW776 [ΔcheA pAR1.cheARVM98L(S−)], and striped bars indicate AJW774 [ΔcheA pAR1.cheARVM98L(S+)]. The mean diameter and standard error of the mean for quadruplicate samples are shown.
