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Immunohistochemical staining for simian virus 40 (SV40). Malignant mesothelioma specimens (a) epithelioid and (b) sarcomatoid were negative for SV40 protein expression in malignant mesothelioma, in contrast to the positive controls (c) Hematoxylin‐eosin (HE) and (d) SV40. Original magnification, ×200.
