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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 that can circulate in the blood, but are also able to exist in tissues, essentially roaming freely in the body looking for work. The subtypes of lymphocytes are T lymphocytes or T-cells, (which play a role in both cell- mediated and humoral immunity) and B lymphocytes or B-cells.