Phenotype of P. mirabilis ΔfliL strain YL1006. (A) Swimming and swarming motilities on Mot agar (left) and hard LB agar (right), respectively. (B) Phase-contrast micrographs of cells of broth-grown cells. Scale bar, 10 μm. WT, wild type. (C) A representative ΔfliL pseudoswarmer cell showing (from left to right) membrane (FM1-43 [green]), nucleoids (DAPI [blue]), and flagella (anti-FlaA immunostaining [red]). Scale bar, 5 μm.