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Photomicrograph of a vaccine associated sarcoma removed 6 months after meloxicam injection. Neoplastic cells within the neoplasm express smooth muscle actin. Expression is most prominent by cells within the periphery of the neoplasm. Lymphoid nodules are visible. Vascular smooth muscle cells provide an internal positive control (arrows). Immunoperoxidase using antibodies against smooth muscle actin with haematoxylin counterstain. Bar = 100 μm.
