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Scanning electron micrographs of invG mutant S. typhimurium strain SB161 adhering to MDCK cells. SB161 exhibited a heterogeneous adherence pattern after infection of MDCK cell monolayers (A). Adherent bacteria mainly formed aggregates linked by long filaments and lacked short filamentous appendages (A). Most bacteria which appeared to adhere independently of the aggregates also lacked short filamentous appendages (B). Bars, 2 μm.
