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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.
There are 2 main types of lymphocytes: 1  B lymphocytes (B cells) protect the body from invading germs by developing (maturing) into plasma cells, which make proteins called antibodies. 2  T lymphocytes (T cells) can recognize cells infected by viruses and directly destroy these cells.