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(A) Normal cecum of a 4-month-old uninfected control IL-10−/− mouse. H&E stain × 75. (B) Focal atypical hyperplasia and diffuse hyperplasia with marked chronic inflammation in cecum of an IL-10−/− mouse, 6 months after infection with the novel urease-negative Helicobacter sp. H&E; magnification, ×30.
