CD31 plays a significant role in intercellular adhesion, which is vital for maintaining the integrity of the vascular endothelium. It facilitates leukocyte transmigration during the immune response and is involved in angiogenesis, the process by which new blood vessels form from pre-existing vessels. Additionally, CD31 is implicated in the formation of intercellular junctions and the prevention of apoptosis in endothelial cells.
