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(A) J774 macrophages after 4 h of incubation with L. plantarum GFP+ bacteria (nisin-induced cells of L. plantarum NCIMB8826 Int-1/pMEC45). Magnification, ×1,000. (B) Thin sections of intestine segments from mice fed L. plantarum GFP+ bacteria, showing fluorescent cells (indicated by arrows) embedded in the mucus. Magnification, ×400.
