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Adhesion of E. coli O157:H7 to intestinal epithelium. (A) HT-29 colonic epithelial cell line; (B) Cattle colonic explant tissues. EDL933: wild-type E. coli O157:H7 strain; EDL933 Δpnp: EDL933 pnp deletion mutant strain, **P < 0.01 (Mean ± SEM; n = 8).
