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Immunogold electron microscopy with anti-FlfA immune serum. G. anatis 12656-12 WT cells (A and B) or ΔflfA mutant cells (C) were incubated with anti-FlfA immune serum and labeled with a secondary antibody conjugated to 10-nm gold particles. Two fimbrial cell populations were observed: a low-level population (A) and a hyperfimbriated population (B).
