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Description
CD11a, also known as leukocyte function-associated antigen-1 (LFA-1), represents the 180 kDa integrin L subunit which combines with the CD18 2 integrin subunit to form the L2 integrin heterodimer. It is expressed on lymphocytes, granulocytes, monocytes, and macrophages and is upregulated on activated T cells. CD11a/LFA-1 mediates adhesion of lymphocytes to vascular endothelium and is involved in costimulation.