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B cell  B cells, a type of lymphocyte (white blood cell), have an important role in the body's immune system. When a B cell encounters an invading bacterium it starts to divide, forming two different types of cell. One type is a clone of itself that begins to produce antibodies to fight the infection; the other is a memory cell that will persist in the bloodstream, ready to produce antibodies should re-infection occur. | Type of lymphocyte (white blood cell) that develops in the bone marrow and aids the immune system by producing antibodies. Each B cell produces just one type of antibody, specific to a single antigen. B lymphocytes are related to T cells. |
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