Motility of the cells harboring various fliX alleles. Cells were inoculated in motility agar and were incubated at 31°C for 3 days. Motile cells swarming away from the points of inoculation are visible as halos. Host strains containing no plasmid reside at the center of each plate.
Xu et al. BMC Microbiology 2011 11:89 doi:10.1186/1471-2180-11-89