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Auto-Immune Diseases

OCR AS-level BiologyCommunicable DiseasesLesson 32 of 40

The immune system may stop recognising the body's own antigens and start attacking body tissues.

This leads to autoimmune diseases.

This could be because the immune system responds abnormally t a midl pathogen or normal body microorganisms or becuase T reg cells do not adequately suppress or regulate the immune response.

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Key terms in this lesson

pathogen
A microorganism that causes disease.
antigen
A molecule, usually a protein, on the surface of a cell or pathogen that triggers an immune response.

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