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Immunohistochemical staining of tropomyosin isoform type 4. Representative photomicrographs of (A) conventional leiomyosarcoma and (B) pleomorphic leiomyosarcoma. Tropomyosin isoform 4 is highly expressed in pleomorphic leiomyosarcoma, but not in conventional leiomyosarcoma (stain, immunohistochemical staining for tropomyosin isoform 4; original magnification, ×200).
