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SEM images of B. bronchiseptica biofilms. BbWT (upper row of panels), Bb-DGC (middle row of panels) and Bb-PDE (bottom row of panels) were grown statically on vertically submerged coverslips in SS medium alone (left column of panels), SS supplemented with 1.0 mM NA (middle column of panels) or SS supplemented with 4.0 mM NA (right column of panels). After 48 h of growth, the biofilms formed at the air–liquid interface were visualized by SEM.
