Immune system. Definition

Medical Definition: immune system

Body's defense mechanism which is divided into innate immunity (the molecular type of acute phase proteins, collectins and defensins, the complement system, interferons and other cytokines, such phagocytic mononuclear cells, natural killer cells) and acquired immunity (T lymphocytes and B with specific receptors, immunoglobulins). Alteration leads to diseases (autoimmune diseases, primary or secondary immunodeficiencies, infections, tumors, allergic reactions, etc.).

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