Figure 6. traA allele–specific regulation of swarming.

Indicated motile strains were mixed with isogenic engineered nonmotile laboratory strains that encoded the indicated traA alleles. Mixtures in which both strains encoded identical traA alleles or belonged to the same recognition group are highlighted with a black border, and they all exhibited swarm inhibition. A nonmotile ΔtraA strain (DW1467) was used as a negative control (full swarming). Stereomicrographs were taken after 2 days of incubation. Assay was done as described [7].