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Pig ileum 14 days post challenge (A) and 42 days post challenge (B). Large numbers of CD163-expressing macrophages diffusely infiltrate the lamina propria of ileum collected from a pig at 14 dpc (A). This is in contrast to the much smaller numbers of CD163-expressing macrophages in the lamina propria of ileum collected from a pig at 42 dpc (B). Envision HRP and haematoxylin counterstain.
