CD20 is a B lymphocyte cell-surface molecule encoded by the MS4A1 gene. It is expressed primarily on the surface of B cells at various developmental stages, including pre-B cells, mature B cells, activated B cells, and memory B cells, while expression is lost on plasmablasts and plasma cells. The precise function of CD20 is not well understood, but it appears to play a role in regulation of B cell activation, proliferation, and differentiation.
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