Antigen - Wikipedia
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 …
Antigen: What It Is, Function, Types, & Testing
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.
Antigen | Definition, Function, Types, & Facts | Britannica
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, …
Antigens: Types, How They Work, Testing, and More
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.
Antigen: MedlinePlus Medical Encyclopedia
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 …
Antibody And Antigen - Immunology Explained
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 …
Understanding Antigens: Types, Functions, Tests, and Risks ...
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 …