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Smooth muscle actin (SMA) expression and EBV RNA is detected in the tumour cells. Sections of the tumor were stained with SMA and CD3 antibodies and couterstained with hematoxylin. Both the round cell (a) and spindle cell (b) areas express SMA. c CD3 antibodies stained scattered T-lymphocytes within the tumor (magnification, all ×400). d In situ hybridization was used to detect the presence of EBER. EBER was diffusely present in the nuclei of the tumor cells (magnification ×400)
