Endothelial sialomucin, also called endomucin or mucin-like sialoglycoprotein, which interferes with the assembly of focal adhesion complexes and inhibits interaction between cells and the extracellular matrix. Highly expressed in heart and kidney, followed by brain, spleen, thymus, liver and lung. Exclusively expressed in endothelial cells. Highly O-glycosylated. Sialic acid-rich glycoprotein.