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 …

Aug 16, 2022 · 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 …

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 …

Aug 5, 2025 · Antigens are molecular structures, often proteins or polysaccharides, that are found on the surface of pathogens such as viruses, bacteria, and fungi. But they can also be found on cancer …

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.

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 …

Antigen A small substance that causes the body to initiate an immune response. Antigens are bound by specific antibodies or cell receptors and can also be presented by cells via MHC class proteins.