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Formalin-fixed and paraffin-embedded tonsil. (A) Actinomycotic clumps surrounded by a few inflammatory cells in a tonsillar crypt in close contact with the area of lymphoepithelial symbiosis. HE. Bar=10 μm. (B-a) Microbial elements immunolabelled by Actinomyces denticolens antiserum in a serial section of A. Bar=10 μm. SAB method. (B-b) Immunolabelling showing A denticolens antigens in a macrophage in the lymphoepithelial symbiosis. Bar=10 μm. SAB method
