L. plantarum prevents EIEC-induced rearrangements of Claudin-1, Occludin, JAM-1 and ZO-1 proteins. The intensity of the stain of the infected cells was decreased compared to that observed for control cells. In addition, areas where the TJ proteins belts were disrupted were present (arrows). Images were collected in 1-μm increments beginning at the apical aspect of the monolayers and optically sectioning to the basolateral membrane. Original magnification ×2400.