REA675 recognizes the human CD19 antigen, a type I transmembrane glycoprotein of 95 kDa that belongs to the immunoglobulin superfamily. CD19 is expressed on B cells throughout most stages of B cell differentiation, though its expression is down-regulated during their terminal differentiation to plasma cells. Expression of CD19 is also found in the majority of B cell–derived malignancies. CD19 is further present on follicular dendritic cells. On B cells, CD19 associates with CD21, CD81, and CD225 (Leu-13) forming a signal transduction complex. Additional information: Clone REA675 displays negligible binding to Fc receptors.
An antibody, specific receptor protein, ligand, nucleic acid sequence (e.g., primer, probe) or similar reagent, which through specific binding or chemical reaction with an intended target, is used to identify or quantify a chemical substance in a biological specimen for the development of a laboratory developed test (LDT) or commercial in vitro diagnostic medical device (IVD). Commonly referred to as an analyte specific reagent (ASR), it is neither labelled with instructions for use nor diagnostic or performance claims.
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