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Antigen - Definition


Definition

Antigens are molecules recognized as foreign bodies that can be present during contamination by viral, fungal, or bacterial germs, a toxin, or a cancerous disease. Their presence in a cell creates a reaction from the body once they are recognized; the making of antibodies enables the body to fight and destroy these antigens. Antigens then provoke an immune reaction. The lymphocytes B and T, white blood cells, also recognize antigens. Antigens are also responsible for allergic reactions.
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