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Swimming motility of P. aeruginosa PAO1, its ppk mutant, and a fliC control strain derived from a P. aeruginosa PAK strain on a semisolid agarose plate. Cells were inoculated with a toothpick from an overnight LB agar plate onto a swim plate (tryptone broth plus 0.3% agarose) and photographed after a 14-h incubation at 30°C. Strains: WT, PAO1; Δppk, PAOM5; and ΔfliC, MS159.
