Please note that I am not a medical professional, but here's a quick summary: Rituximab is a monoclonal antibody that targets a receptor (CD20) that is found on the surface of B cells in the immune system. In chronic lymphocytic leukemia (CLL), too many (immature) lymphocytes are produced in the bone marrow, and so Rituximab can help reduce that excess. Note that it will instruct the immune system to destroy both healthy and immature B-cells, which causes some of the medication's side effects. I hope this was helpful; please check with a medical professional for more detailed information.
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