REA747 recognizes the human CD45 antigen, a member of the protein tyrosine phosphatase (PTP) family, also known as the leukocyte common antigen (LCA). The CD45 molecule a type I transmembrane protein which is required for T and B cell activation and involved in cell growth, differentiation, mitotic cycle, and oncogenic transformation. CD45 is expressed in different isoforms (CD45RA, CD45RB, CD45RC, CD45RAB, CD45RAC, CD45RBC, CD45RO, CD45R (ABC)) depending on the differentiation status of the cell. The CD45 antibody recognizes a common epitope of all CD45 isoforms. Additional information: Clone REA747 displays negligible binding to Fc receptors.

Reagent can be used for immunophenotyping by flow cytometry. Abnormal numbers of cells expressing this antigen or aberrant expression levels of the antigen can be expected in some disease states. It is important to understand the normal expression pattern for this antigen and its relationship to expression of other relevant antigens in order to perform appropriate analysis.

Expression of CD45 may be used as aid to diagnostic in the characterization of samples from individuals suspected with hematologic neoplasia.