Lymphatic vessel endothelial hyaluronan receptor 1 (LYVE-1), also known as extracellular link domain-containing protein 1 (XLKD1), is a type I integral membrane glycoprotein. LYVE-1 is a CD44 homolog found primarily on lymphatic endothelial cells, but has also been described on hepatic blood sinusoidal endothelia, embryonic blood vessels, Kupffer cells, the islets of Langerhans, cortical neurons, and renal epithelium (1-3). LYVE-1 acts as a receptor for hyaluronan, and plays a role in hyaluronan transport and turnover (4-7). LYVE-1 also mediates the docking and entry of dendritic cells to lymphatic vessels through selective adhesion to hyaluronan in the leukocyte surface glycocalyx (8). Several studies have demonstrated the utility of LYVE-1 as a marker for lymphoid tissues and lymphangiogenesis (9,10).