Antigens are usually proteins or sugars (polysaccharides) found on the outside of things like cells or viruses. Each has a unique shape that your immune system reads like a nametag to know whether it …

All immunogens are antigens, but not all antigens are immunogens. The antigen within a vaccine is often referred to as an immunogen, even if, strictly speaking, its purified form cannot induce immune …

Dec 20, 2025 · Antigen, substance that is capable of stimulating an immune response, specifically activating lymphocytes, which are the body’s infection-fighting white blood cells. In general, two main …

Antigens are how the body identifies foreign substances. Antigens exist on viruses, bacteria, allergens, parasites, proteins, cancer cells, and normal cells in your own body.

Oct 25, 2023 · Learn about antigens. Get the antigen definition and learn about the types, functions, and types of tests in immunology.

Mar 30, 2023 · Antigens are molecules or molecular structures that are foreign to the body and generally induce an immune reaction in the form of the production of antibodies against them.

Antigens play a role in the immune system, acting as molecular markers that trigger an immune response. These substances help distinguish between self and non-self entities within the body, …

Jul 8, 2023 · An antigen is any substance that causes your immune system to produce antibodies against it. This means your immune system does not recognize the substance, and is trying to fight it …

Apr 22, 2022 · Any foreign invaders, such as pathogens (bacteria and viruses), chemicals, toxins, and pollens, can be antigens. Under pathological conditions, normal cellular proteins can become self …

What are antigens? Antigens are molecules that trigger the production of antibodies by inducing an immune response.