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Immune system structures

Immune system structures

The immune system protects the body from potentially harmful substances. The inflammatory response (inflammation) is part of the immune response. It occurs when tissues are injured by bacteria, viruses, trauma, toxins, or other causes.

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Review Date: 7/3/2011

Reviewed By: Harvey Simon, MD, Editor-in-Chief, Associate Professor of Medicine, Harvard Medical School; Physician, Massachusetts General Hospital.

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