CD20 Monoclonal Antibody (QCH6A7), Brilliant Violet™ 421

Description: The monoclonal antibody QCH6A7 reacts with mouse CD20. CD20 is a B cell specific, 32-kDa membrane protein that is expressed on late pro-B cells through memory B cells in the B cell lineage. CD20 is not found on hematopoietic stem cells, early pro-B cells or later mature plasma cells. CD20 is involved in intracellular calcium regulation and plays a role in B cell proliferation. CD20 is initially expressed after the induction of CD19 during development and is co-expressed with IgM during the pre-B to immature B cell transition in bone marrow. Expression of CD20 increases during maturation with almost all mature B cells expressing some level of CD20. Unlike other B cell antigens, CD20 is not shed or internalized upon antibody binding. Monoclonal antibodies against the CD20 antigen may be used to deplete B cells and CD20 has proven to be an effective immunotherapeutic target in B cell lymphomas and several autoimmune diseases including rheumatoid arthritis and type I diabetes.