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Transmission electron micrographs of ileal explants inoculated with the wild-type O45 strain 86-1390 (A; magnification, ×20,664), the complemented mutant strain M155c (B; magnification, ×20,702), or TnphoA mutant M155 (C; magnification, ×13,500). Typical A/E lesions were observed for both wild-type and complemented-mutant strains, whereas bacteria in the lumen without any direct contact with the epithelium were observed for the mutant M155.
