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SEM images of aroA cells collected from earlier (14-h) (a) and later (24-h) (b) stationary-growth-phase cultures in TSB and after 90 days of incubation in sterilized fish tank water at 20°C (c and d). Arrows in panel c indicate coccoid cells, and the boxed field is magnified in panel d. Bars, 1 μm.
