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Immunohistochemistry staining of human saphenous vein (SV). The endothelial nitric oxide synthases (brown) were stained along with the luminal surface. Adventitial cross-linking preserved the endothelial integrity largely by comparing immunohistochemistry images (magnification, ×200) in different groups. A) Native SV; B) cross-linked and expanded SV; C) non-cross-linked and expanded SV.
