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Description
CD51 represents the 150 kDa integrin V chain that associates with integrin 3 (CD61) to form the CD51/CD61 vitronectin receptor on endothelial cells, certain activated leukocytes, NK cells, macrophages, neutrophils and platelets. CD51 is the most promiscuous integrin a subunit, it can form heterodimers with the 1 (CD29), 3 (CD61), 5, 6 and 8 subunits in various tissues. CD51/CD61 acts as an activation-independent receptor for platelet attachment and spreading on vitronectin and other RGD-containing proteins, including matrix components. It also mediates leukocyte-endothelial cell adhesion via interaction with CD31.