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Location of IL-18 in human myocardium. Immunohistochemical staining of human atrial tissue before insertion of atrial canula. (Left) Section through an atrial blood vessel. IL-18 is present within vascular endothelial cells (EC) and in resident myocardial macrophages (Mφ) (Right) Section through atrial muscle. Myocytes (Myo) are identified and IL-18 is observed in the resident macrophages. In this staining technique, IL-18 appears pink.
