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Feline vaccine-associated sarcoma cells stained for a) vimentin, note a strong cytoplasmic staining reaction (brown color), original magnification 400×, b) smooth muscle actin, original magnification 400×, c) desmin, original magnification 400×, d) cytokeratin, original magnification 200×. Peroxidase-based EnVision™kit (DakoCytomation, Denmark) and haematoxylin counterstain
