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High endothelial venules

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High endothelial venules, or HEVs, are a subtype of blood endothelium present within lymph nodes; used by various leukocytes to gain entry into the lymph node via the blood. The HEVs are made up of cuboidal endothelial cells, with various receptors to allow entry/rolling interactions between leukocytes and the endothelium.