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View synonyms for antigen

antigen

[ an-ti-juhn ]

noun

  1. Immunology. any substance, as a protein, carbohydrate, etc., that, on entering the body, can stimulate an immune response and combine with a specific antibody or T cell receptor having a matching molecular structure.
  2. Pharmacology. any commercial substance, usually synthetic, that stimulates the production of antibodies when injected or absorbed into animal tissues.
  3. antigens of a particular type collectively.


antigen

/ -ˌdʒɛn; ˈæntɪdʒən /

noun

  1. a substance that stimulates the production of antibodies
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

antigen

/ ăntĭ-jən /

  1. A substance that stimulates the production of an antibody when introduced into the body. Antigens include toxins, bacteria, viruses, and other foreign substances.
  2. Compare antibodySee Note at blood type
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Derived Forms

  • ˌantiˈgenic, adjective
  • ˌantiˈgenically, adverb
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Other Words From

  • an·ti·gen·ic [an-ti-, jen, -ik], adjective
  • an·ti·gen·i·cal·ly adverb
  • an·ti·ge·nic·i·ty [an-ti-j, uh, -, nis, -i-tee], noun
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Word History and Origins

Origin of antigen1

First recorded in 1905–10; anti(body) + -gen
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Word History and Origins

Origin of antigen1

C20: from anti ( body ) + -gen
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Compare Meanings

How does antigen compare to similar and commonly confused words? Explore the most common comparisons:

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Example Sentences

The new vaccine combines the traditional pertussis antigens with an innovative adjuvant called T-vant, which boosts the body's immune response specifically in the respiratory tract.

The kits offered by the federal government contain antigen tests, which look to see whether a sample taken from your nostrils contains a protein that binds to the coronavirus’ RNA.

Each contains different antigens and antibodies, meaning that receiving blood from the wrong group can be life-threatening.

From BBC

Thus IFN-gamma responses are marker of vaccine candidate antigens and efficacy.

Then, they also added molecules and antigens common to cancer cells to "teach" T-cells what to look for.

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Related Words

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More About Antigen

What does antigen mean?

An antigen is a substance that causes an immune response in the body—specifically, an antigen causes the body to produce antibodies. Antigens are things like viruses, bacteria, toxins, cancer cells, and other foreign substances, like the cells of a transplanted organ.

An antibody is a protein produced by some cells as part of the immune system’s defenses. Antibodies attach to antigens and make them harmless or help the body to destroy them.

Antigens are studied in fields like immunology, virology, and pharmacology. Most vaccines contain forms of antigens that trigger the body to produce specific antibodies to fight that antigen.

Why is antigen important?

There are a lot of things that can get inside the body that we don’t want to be there, like viruses, bacteria, and toxins—all of these things are antigens. But antigen doesn’t necessarily mean something bad—it specifically refers to a substance that causes the body to create antibodies. (For example, the cells of transplanted organs can be considered antigens if they trigger an immune response.) In fact, antigen is a combination of the word antibody and the suffix gen, which means “that which produces.”

When antigens enter the body, a healthy immune system goes on alert. White blood cells called lymphocytes identify and target the antigen and start the production of antibodies. The antibodies find the antigens, attach to them, and then deactivate them or lead them to special white blood cells (called macrophages) that basically eat and destroy them (cue the Pac-Man music). If the same antigen shows up again, the body will be able to quickly manufacture more of those specific antibodies to counter the threat.

This is how vaccines work. Vaccines consist of a small amount of an antigen, such as a virus or bacterium, that has been killed, weakened, or modified so that it’s not harmful. Introducing this small amount trains the body to identify that specific antigen and create defenses against it in case it ever appears in the body again.

Sometimes, antigens are identified as harmful by our bodies when they’re really not. This can happen with transplanted organs and in autoimmune diseases, but also in a much more common scenario: allergies. An allergen like pollen acts as an antigen, causing the immune system to kick in when it doesn’t really need to.

Did you know ... ?

Blood types (A, B, AB, and O) are based on the presence or absence of specific antigens on red blood cells.

What are real-life examples of antigen?

This graphic shows an illustration of antibodies attacking an antigen—a virus.

 

Quiz yourself!

What do antigens trigger the production of? 

A. viruses
B. allergies
C. pathogens
D. antibodies

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antigayantigenic determinant