The endothelium is the layer of thin specialized epithelium, comprising a simple squamous layer of cells that line the interior surface of blood vessels, forming an interface between circulating blood in the lumen and the rest of the vessel wall (simple squamous epithelium). Endothelial cells line the entire circulatory system, from the heart to the smallest capillary. These cells reduce friction of the flow of blood.
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Protein Aliases: Endothelial cell marker; Endothelial cells; Endothelium Cell Antigen-1; Pan endothelial cells