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In situ imaging of the gastrointestinal tract highlights a complex environment. Intestinal sections were stained with 4′,6-diamidino-2-phenylindole (DAPI) (false colored blue in tissue and cyan in lumen) and labeled with fluorescence in situ hybridization (FISH) probes (red, Bacteroidaceae; green, Enterococcus) and UEA-1 (green) to label mucus.
