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Representative epifluorescent micrographs of Caco-2 monolayers stained with the absorptive enterocyte marker Ulex europaeus agglutinin-1 (red), the M-like cell specific marker galectin-9 (green diffuse cellular staining), and Hoechst nuclear stain (blue). (a) Monolayers treated with GFP Escherichia coli C25 (arrows) and C. jejuni 81-176. (b) Monolayers treated with only GFP E. coli C25 (control). Bar = 2 μm.
