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Overview
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Recognizes the human CD33 cell surface glycoprotein. CD33 is a transmembrane protein ofthe sialic acid-binding immunoglobulin-like lectin (Siglec) family. It belongs to the immunoreceptortyrosine-based inhibitory motif (ITIM)-containing molecules able of recruiting protein tyrosinephosphatases SHP-1 and SHP-2 to signal assemblies, and these ITIMs are also used for ubiquitin-mediated removal of the receptor from the cell surface. CD33 is expressed on cells ofmyelomonocytic lineage, binds sialic acid residues in N-and O-glycans on cell surfaces, and is atherapeutic target for acute myeloid leukemia. Further, CD33 is found on granulocyte andmacrophage precursors in the bone marrow, but is not on pluripotent stem cells. CD33 is alsoexpressed on, and is a useful marker for, peripheral monocytes. CD33 is useful for distinguishingmyelogenous leukemia cells from lymphoid or erythroid leukemias.
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Overview