In immunology, an antigen is a substance that evokes the production of one or more antibodies.
Each antibody binds to a specific antigen by way of an interaction
similar to the fit between a lock and a key. The substance may be from
the external environment or formed within the body. The immune system
will try to destroy or neutralize any antigen that is recognized as a
foreign and potentially harmful invader. The term originally came from
antibody
generator
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