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STEM images of L. monocytogenes. (A) L. monocytogenes strains grown to early exponential phase were fixed and imaged by STEM. (B to D) Representative examples of ΔspxA1 filaments. Boxed portions of each image are shown magnified below. Black arrows indicate septa forming outside the cell midpoint, irregularly spaced, and atypically close together. Scale bars are indicated in each panel.
