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(A) Nests of undifferentiated nasopharyngeal carcinoma in lymphoplasmocytic stroma. Tumour cells are strongly stained by in situ hybridisation to detect nuclear Epstein-Barr virus encoded RNA (EBER); original magnification, ×80. (B) High magnification of nuclear staining for EBER by in situ hybridisation; original magnification, ×350).
