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The Adobe Flash Player is required in order to view this content. You can get it here: immune systemOne entry found. Main Entry: immune system Function: noun Date: circa 1919 : the bodily system that protects the body from foreign substances, cells, and tissues by producing the immune response and that includes especially the thymus, spleen, lymph nodes, special deposits of lymphoid tissue (as in the gastrointestinal tract and bone marrow), macrophages, lymphocytes including the B cells and T cells, and antibodies 
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