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Pcb1692 wild‐type cells are flagellated, whereas Pcb1692ΔexpI cells lack flagella and are hyperpiliated. Transmission electron microscopy was used to view cells of the wild‐type and mutant strains after overnight culture in Luria–Bertani (LB) broth and stem inoculation at 6, 24 and 72 h post‐inoculation (hpi). Flagella are indicated with full blue arrows and pili/fimbriae by broken red arrows.
