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The surface-associated motility (A) and twitching motility (B) defect of mutant MR14. Phenotypes of parental strain Acinetobacter baumannii ATCC 17978 and the transposon insertion mutant MR14 on 0.5% agar motility plates incubated for 16 h at 37 °C. (A) A 1 µL drop of each strain was placed on the surface of semisolid agar plate, and (B) stab-inoculated into the interphase between the bottom of the agar layer and the polystyrene Petri dish.
