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Chemotaxis in semisolid agar and production of flagella. (A) Chemotactic ability of each mutant was determined by stabbing cells into swarm plates. Strain genetic backgrounds are indicated above each swarm location. The ΔvieSAB, ΔtoxR, ΔtoxT, and ΔtcpA strains were described (9, 10). (B–G) Production of the polar flagellum was determined by electron microscopy. The genetic background of each strain is indicated at bottom right corner.
