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Figure 4 Immunohistochemical localization and patterns of platelet adhesion/thrombus formation in atrial appendages of cardiac patients. Immunohistochemistry for glycoprotein Ib/IX and endothelial nitric oxide synthase in serial sections is shown in three typical cases. P = patchy platelet adhesion; T = thrombus; W = widespread platelet adhesion. Bar = 100 µm.