Definition for "Antigen"

Etymology

Contraction of antibody-generator.
....Source from : Wiktionary

Antigen - (Noun)

phonetic : /ˈantijən/ http://www.gstatic.com/dictionary/static/sounds/de/0/antigen.mp3
1. A toxin or other foreign substance that induces an immune response in the body, esp. the production of antibodies
....Source from : Google Definitions

(n) antigen (any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies))
....Source from : wordnetweb

immunology A substance that induces an immune response, usually foreign.
....Source from : Wiktionary

Antigen - (General)

1. any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies)
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2. (antigenic) of or relating to antigens
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3. An antigen is a molecule recognized by the immune system. Originally the term came from antibody generator and was a molecule that binds specifically to an antibody, but the term now also refers to any molecule or molecular fragment that can be bound by a major histocompatibility complex (MHC) ...
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4. The ABO blood group system is the most important blood type system (or blood group system) in human blood transfusion. ...
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5. A substance that induces an immune response, usually foreign
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6. Antigens are molecules that stimulate an immune system response. Bacteria, viruses, and other microorganisms are types of antigens.
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7. Antigens are substances that cause a person’s immune system to react, either mildly or severely. A person’s system will detects antigens as foreign matter and try to eliminate them through the production of antibodies (which help neutralize antigens). ...
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8. (antigens) Molecules carried or produced by microorganisms that initiate antibody production; mostly proteins or proteins combined with polysaccharides.
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9. (Antigens) Foreign macromolecules—normally proteins, carbohydrates, or nucleic acids—that trigger the immune response.^ 3
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10. (Antigens) Specific structures on the cell surface of bacteria, viruses or fungi. If the body is attacked by such pathogens, the plasma cells developed from the B-lymphocytes form antibodies.
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11. (Antigens) a substance that the body recognizes as 'nonself' or 'foreign' and against which a specific immune response is mounted. Antibodies have a complementary chemical structure to a portion of an antigen and bind to the antigen, analogous to the manner in which a key fits into a lock.
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12. (Antigens) any molecule that our immune system will mount a specific response against. Each antigen may have multiple locations, or epitopes, where antibodies actually bind. Antigens can be proteins, lipids (fats), carbohydrates, glycoproteins or lipoproteins.
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13. (Antigens) proteins that are located on the surface of all cells, which help our Immune System identify invading organisms and abnormal or cancerous cells from normal healthy.
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14. A substance on the surface of red Blood cells that elicits an immune response when transfused into a patient who lacks that antigen.
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15. Any substance that when introduced into the body (such as the protein coat of an invading pathogen) causes the formation of antibodies. Ag is also found on tissue and blood cells, and in body fluids. Measurement of antigen can help determine whether a particular disease will become active.
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16. Any foreign material that is specifically bound by specific antibody or specific lymphocytes; also used loosely to describe materials used for immunization. Antigens may also be immunogens if they are able to trigger an immune response, or haptens if not.
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17. An antigen is any substance that the body identifies as potentially dangerous and against which it produces a defence (an antibody).
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18. a protein produced by the immune system in response to an infection or other stimulation (i.e. allergies, etc).
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19. A substance that reacts with antibodies or memory T cells to give rise to an immune reaction. An antigen that binds with a specific antibody or T cell can give rise to allergy.
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20. A structure foreign to the body, such as a virus. The body usually responds to antigens by producing antibodies.
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21. Component of a foreign biological substance (transplanted tissue, invading virus, etc.), which stimulates the host's immune system to attack that foreign substance by elaborating an antibody (q.v.) that destroys the antigen and, in so doing, usually results in damage to the "invader"
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22. A substance that, when introduced into the body, stimulates the production of an antibody.
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23. A substance capable of stimulating an immune response by triggering the production of antibodies.
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24. A chemical substance that induces an immune responsiveness after a latent period (days to weeks). For example, there is a protein antigen on the surface of the influenza virus called hemagglutinin which induces protective antibody to be made after infection or vaccination.
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25. An antigen is the part of a ger (bacteria or virus) that the body's immune system can recognize and attack t prevent the germ from causing disease. ...
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....Source from : Google Definitions