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Head and neck squamous cell carcinomas (HNSCC) express Toll-like receptor 2 (TLR2), TLR3 and TLR5. The sections show keratinized squamous cell carcinomas from the larynx. The tumour sections were stained with antibodies against (a) TLR2, (b) TLR3 and (c) TLR5. For localization, the sections were stained with 3,3′-diaminobenzidine (DAB; brown staining) and analysed by microscopy (magnification ×4, ×10 and ×40). The arrows indicate TLR-positive cells.
