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. 2007 Aug 14;3:18. doi: 10.1186/1746-6148-3-18

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Copyright © 2007 Smeed et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Histopathology of the terminal ileum from multibacillary sheep. (a) Ziehl-Neelsen stain (× 250) showing the presence of many intracellular mycobacteria associated with the infiltrating macrophages. (b) H&E stained low power (×250) showing infiltration of the lamina propria by sheets of epithelioid macrophages distending the propria and flattening the surface mucosa. (c) H&E stained high power (×400) demonstrating the uniform population of epithelioid macrophages with abundant cytoplasm infiltrating around an intestinal crypt.