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M. microti tuberculous lesion in a field vole. Macrophages and acid-fast bacilli. Epithelioid macrophage (arrowhead) and multinucleated giant cell (arrow) with large aggregate of acid-fast bacilli within phagosome. Ziehl-Neelsen stain. Inset: Lysozyme expression in epithelioid macrophages, particularly in multinucleated giant cells. Peroxidase anti-peroxidase method, Papanicolaou hematoxylin counterstain.
