|Detection of CD19 in Human Blood Lymphocytes by Flow Cytometry. Human peripheral blood lymphocytes were stained with Mouse Anti-Human CD3 epsilon PE‑conjugated Monoclonal Antibody (Catalog # FAB100P) and either (A) Mouse Anti-Human CD19 Alexa Fluor® 750‑conjugated Monoclonal Antibody (Catalog # FAB4867S) or (B) Mouse IgG1 Alexa Fluor 750 Isotype Control (Catalog # IC002S). View our protocol for Staining Membrane-associated Proteins.|
CD19 is a 95 kDa transmembrane glycoprotein with two Ig-like C2-set domains. CD19 regulates B cell development and activation through interactions with CD21, CD22, and the B cell receptor. CD19 polymorphisms and up‑regulation lead to the development of autoimmunity by promoting autoantibody production. Within the extracellular domain, human CD19 shares 57% amino acid sequence identity with mouse and rat CD19.
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