Flagella filaments. Visualization of cell flagella extracted from the leading colony edges grown on swarming plates. (A) Typical swarming cell from the JMG1655 ΔrecA (pRecA-Htg) strain. (B) Typical swarming cells from the JMG1655 ΔrecA (pCA24N) strain. The arrow indicates the position of the flagella in the preparation. Bar 10 μm.