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Immunohistochemistry (IHC) detection of PrPCWD in rectal biopsy sample from a red deer (Cervus elaphus elaphus) 214 d after oral inoculation with infectious CWD material. Lymphoid follicles beneath the rectal epithelium have variable degrees of immunolabelling associated with tingible body macrophages and follicular dendritic cells. Monoclonal antibody F99/97.6.1 and hematoxylin counterstaining. Bar = 150 μm.
