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Overview
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CD33 is a 67 kDa glycoprotein of the sialic acid-binding immunoglobulin-like lectin (SIGLEC) family, displaying the immune-receptor tyrosine-based inhibitory motif (ITIM), able of recruiting proteintyrosine phosphatases SHP-1 and SHP-2 to signal assemblies. ITIMs are also used for ubiquitin-mediated removal of the receptor from the cell surface. CD33 is expressed on cells of myelomonocyticlineage, binds sialic acid residues in N-and O-glycans on cell surfaces, and is a therapeutic target foracute myeloid leukemia. CD33 is expressed on myeloid progenitors, monocytes, granulocytes, dendritic cells and mast cells. It is absent on platelets, lymphocytes, erythrocytes and hematopoieticstem cells.
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Overview