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 …

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.

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.

Since the enemy substance actually triggers the production of antibodies, such substances are called antigens— anti- being short for antibody, and -gen meaning "producer". (In a similar way, an allergen …

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 …

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 …

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.

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 …

Mar 6, 2025 · What is an antigen in simple terms? An antigen is a foreign substance, such as bacteria, viruses, or pollen, that triggers an immune response in the body, especially the production of …