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Immunology is the study of the immune system and is a very important branch of the medical and biological sciences. The immune system protects from us If the immune system is not working as it should, it may result in disease, such as autoimmunity, allergy and cancer. It is also becoming clear that immune responses to the development of many common disorders, not traditionally viewed as immunologic, including metabolic, cardiovascular, and neurodegenerative conditions such as Alzheimer's.