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What are antigens and antibodies?


In Immunology, an antigen is a molecule or molecular structure that can bind to a specific antibody or T-cell receptor OR it is a complex molecule normally protein or a polysaccharide that stimulate the production of a particular antibody. This means your immune system does not recognize the substance, and is trying to fight it off. An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen.


An antibody, also called immunoglobulin, are protective protein produced by the immune system in response to the presence of a foreign substance.

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