A substance being studied in the treatment of several types of lymphomalymphoma. It binds to the proteinprotein CD20CD20, which is found on B cellcells (a type of immune systemimmune system cellcell) and some types of lymphomalymphoma cellcells. This causes the immune systemimmune system to kill the cancercancer cellcells. hA20 is a type of monoclonal antibodymonoclonal antibody.
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