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Lymphocytes Defined

Lymphocytes are types of white blood cells that help the immune system defend against disease and infection.

There are two main types of lymphocytes: T-cells and B-cells. T-cells fight infected cells and tell other cells to fight. B-cells make antibodies (also known as immunoglobulin or Ig) that target specific germs.

Learn more about the role of lymphocytes in primary immunodeficiency diseases (PIDD).