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Histological examination of PPs after infection with Ye. C57BL/6 mice were orally infected with either wild-type Ye (1 × 107 cfu) or the rovA mutant (5 × 109 cfu) for the indicated amount of time. To visualize inflammation intestinal sections were stained with hematoxylin and eosin. As a control mice were mock-infected with PBS. (Original magnification: ×40.)
