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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 critical cells in the immune system. They are white blood cells that are made in the bone marrow and eventually become specialized into two main types -- T cells and B cells. Although both types of lymphocytes are important, they play different roles in helping the body eliminate invaders.