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antigen

   Also found in: Dictionary/thesaurus, Medical, Legal, Acronyms, Wikipedia, Hutchinson 0.01 sec.
antigen: see immunity immunity, ability of an organism to resist disease by identifying and destroying foreign substances or organisms. Although all animals have some immune capabilities, little is known about nonmammalian immunity.
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antigen

Foreign substance in the body that induces an immune response. The antigen stimulates lymphocytes to produce antibodies or to attack the antigen directly (see antibody;immunity). Virtually any large foreign molecule can act as an antigen, including those of bacteria, viruses, parasites, foods, venoms, blood components, and cells and tissues of various species, including other humans. Sites on the antigen's surface fit and bind to receptor molecules on the lymphocytes' surface, stimulating the latter to multiply and initiate an immune response that neutralizes or destroys the antigen.
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Of 45 people whose autoimmune-based uveitis was being held in check with steroids and other medication, 10 received pure retinal S antigen orally, 10 got a mixture of other cow retinal constituents, 10 took a combination of the S antigen and the bovine mixture, and 15 received a placebo.
Cow protein may help eye inflammation by Seppa, Nathan / Science News
a leader in securing the information workplace, today announced that Antigen 7.
Sybari Responds to the Demand for Best-of-Breed Antispam Protection ... by Business Wire
When injected into chickens, this experimental antigen stimulates production of antibodies, McCandliss says.
Poultry coccidiosis vaccine on horizon by Science News
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