Aug 16, 2022 · An antigen is anything recognized by your immune system. Antigen tests diagnose viral infections, monitor certain illnesses or look for stem cell compatibility.

At the molecular level, an antigen can be characterized by its ability to bind to an antibody's paratopes. Different antibodies have the potential to discriminate among specific epitopes present on the …

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 …

Sep 5, 2025 · An antigen is a molecule that may be recognized by the immune system and trigger an immune response by activating leukocytes (white blood cells) that fight disease.

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. When the immune system …

Aug 5, 2025 · The term “antigen” is short for antibody generator, which offers the first clue about its purpose. Antigens are molecular structures, often proteins or polysaccharides, that are found on the …

Oct 25, 2023 · An antigen is a molecule or particle, often found on the surface of cells, viruses, or bacteria, that triggers an immune response because the body recognizes it as foreign or non-self.

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.

An antigen is a molecule - commonly a protein, polysaccharide, lipid, or nucleic acid - that the immune system recognizes as foreign, leading to initiation of a targeted immune response.

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 …