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The immune system is a group of cells, molecules and tissues that help defend the body against diseases and other harmful invaders.

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This article will give you an introduction to the roles of the different white blood cells and a final section on blood clotting and platelets.

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Function of white blood cells.

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The white blood cells have two different varieties, these are under the two general groups; the phagocytes and the other one is the lymphocyte.