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Formalin-fixed, paraffin-embedded human Tonsil stained with CD74 Mouse Monoclonal Antibody (CLIP/813).
Immunofluorescent staining of Raji cells. CD74 Mouse Monoclonal Antibody (CLIP/813) followed by goat anti-Mouse IgG-CF488 (Green). The nuclear counterstain is Reddot (Red)
It recognizes a protein of ~35kDa, identified as CD74. It is a type II transmembrane protein which binds to the peptide binding groove of newly synthesized MHC class II alpha/beta heterodimers and prevents their premature association with endogenous polypeptides. CD74 is expressed primarily by antigen presenting cells, such as B-lymphocytes (from before the pre-B cell stage to before the plasma cell stage), macrophages, and monocytes, and many epithelial cells. Anti-CD74 stains predominantly germinal center lymphocytes and B-cell lymphomas, but rarely T-cell lymphomas. Anti-CD74 has been shown to be useful in differentiating atypical fibroxanthoma (-) from malignant fibrous histiocytoma (+).
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