Define Antibody.
Topic: Human health and diseases
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When you read about antigen and antibody, you will begin to understand that these have something to do with the immunity in the body. In the field of microbiology and immunology, the antigen-antibody complex has a major role.
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Antibodies are proteins also called immunoglobulins. Each with 4 polypeptide bonds bonded in "Y" shape. They are probing tools which attach to antigen in a unique way. This allows diagnostic applications such as pregnancy tests and cancer treatments. It is produced by immune system. When an alien substance enters the body, the immune system identifies it as foreign because molecules antigen's surface differ from those found in the body.
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