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Antibody

Updated: 12/8/2022
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13y ago

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An antibody is a type of protein. The body's immune system produces antibodies when it detects harmful substances, called antigens. Examples of antigens include microorganisms (such as as bacteria, fungi, parasites, and viruses) and chemicals.

Antibodies are also be produced when the immune system mistakenly considers healthy tissue a harmful substance. See: Autoimmune disorders

Each type of antibody is unique and defends the body against one specific type of antigen.

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13y ago
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12y ago
Definition

An antibody is a protein produced by the body's immune system when it detects harmful substances, called antigens. Examples of antigens include microorganisms (such as bacteria, fungi, parasites, and viruses) and chemicals.

Antibodies are also produced when the immune system mistakenly considers healthy tissue a harmful substance. See: Autoimmune disorders

Each type of antibody is unique and defends the body against one specific type of antigen.

Reviewed By

Review Date: 11/14/2010

David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

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