FIGURE 3.

The swarming assays for all RR gene mutants. The culture of each strain was inoculated onto nutrient medium with 0.6% agar in an 18-cm diameter Petri dish, and incubated for 3 days at 28°C. The swarming ability of each strain was measured by colonial diameter and size, and the results were the average of three independent experiment (Table 2). The top position in each Petri dish is the colony of wild-type strain, and the name of each mutant was labeled beneath the colony of the corresponding mutant.