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Endothelial cell immunostaining of representative abdominal aortic aneurysms (AAA). Immunohistochemical AAA staining showed mural endothelial cell expression, with immunofluorescence staining of the outlined region demonstrating the more intense RGD-HFn-Cy5.5 signal (red), colocalizing with the adventitial endothelial cells (asterisk, green; arrowheads), as compared to HFn-Cy5.5 (see text for quantitative colocalization analysis).
