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Transmission electron micrographs of T84 cells grown on transwells, infected by PilT+ (A– C) or PilT− bacteria (D– F) during 9 h. PilT− bacteria adhere to the epithelial cells without ever inducing intimate attachment even though they were in close contact with the cytoplasmic membrane of T84 cells (arrows). Note the presence of numerous microvilli at the surface of epithelial cells (D– F) (Bars = 0.5 μm.)
