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A lymphocyte is a type of white blood cell. White blood cells are part of your immune system and help your body fight off diseases, including infections and cancer. There are two main types of lymphocytes â B cells and T cells.
Lymphocytes are small cells, 7-9 m in diameter in blood smears, and are the second most common white blood cell type, comprising about 30 % of the leukocyte population in peripheral blood. Lymphocytes have a round heterochromatic (deeply staining) nucleus surrounded by a relatively thin rim of cytoplasm.