|Detection of CD19 in Human PBMCs by Flow Cytometry. Human peripheral blood mononuclear cells (PBMCs) were stained with Mouse Anti-Human CD3 epsilon APC‑conjugated Monoclonal Antibody (Catalog # FAB100A) and either (A) Mouse Anti-Human CD19 Biotinylated Monoclonal Antibody (Catalog # FAB4867B) or (B) Mouse IgG1 Biotinylated Isotype Control (Catalog # IC002B) followed by Streptavidin-Phycoerythrin (Catalog # F0040). 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 (Accession # P15391) shares 57% amino acid sequence identity with mouse and rat CD19.
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