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(genetic biology)

Grammar: noun
plural: antigens
Definition: any substance introduced into the body that stimulates the production of antibodies
Example:
1. Antigens include toxins, bacteria, foreign blood cells, and the cells of transplanted organs.

2. An antigen is a substance (usually a protein) that is identified as foreign by the body's immune system, triggering the release of antibodies as part of the body's immune response.
Related Word: antigenic (adjective)