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Representative photomicrographs showing positive immunohistochemical staining (arrows) for nuclear factor (NF)-κB p50 (a) and NF-κB p65 (b) proteins in paraffin wax-embedded sections of thyroid carcinoma. Sections were counter-stained with haematoxylin. The colour version of this figure is available at: http://imr.sagepub.com. Scale bar 25 µm.
