Antigen

Antigen - A foreign substance (such as a virus or bacteria) introduced into the body that stimulates an immune system response, often triggering the production of antibodies. Antibodies bind to, and work against a specific antigen, to help destroy it. In treating cancer, doctors may introduce substances into the body that heighten the body's response to antigens and provoke an immune response against both the decoy substance and cancerous cells.

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