The L17F12 monoclonal antibody specifically binds to CD5 which is also known as Lymphocyte antigen T1 (T1) or LEU1/Leu-1. CD5 is an ~67 kDa single-chain, type 1 transmembrane glycoprotein expressed on most thymocytes, the majority of peripheral T lymphocytes and a subpopulation of B cells. CD5+ B cells produce polyreactive antibodies (mostly IgM). This CD5-specific antibody also reacts with many T-cell leukemias and lymphomas and most Ig+ B-cell chronic lymphoblastic leukemia (B-CLL) cells. CD72 has been shown to be the natural ligand for CD5.
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