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Antibodies directed against the protein CD20, which is expressed by immune cells known as B cells, are used to treat B cell non-Hodgkin lymphoma and rheumatoid arthritis. Despite this, the function of CD20 has not been determined. Now, a team of researchers led by René van Lier, at the Academic Medical Center, The Netherlands, has determined that CD20 has a nonredundant role in generating optimal B cell immune responses by analyzing a patient lacking the protein.

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