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Micrograph A: most of the neoplasm cells were positive (nasopharyngeal carcinoma, ×100, bar = 100 µm), as indicated by the arrow at high magnification (×200). Micrograph B: although some positive lymphocytes are apparent (arrow), no neoplasm cells were positive. Micrographs C and D: Sections stained with hematoxylin and eosin (HE).
