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Enteropathogenic E. coli forming a macrocolony on cultured CaCo2 colorectal epithelial cells. Bacteria (orange) are stained with an anti-E. coli lipopolysaccharide antibody. Cellular actin (magenta) is used for colonization and infection. DAPI staining (cyan) labels DNA.

Image courtesy of Katrina Velle and Ken Campellone.