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 …

Nov 12, 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, …

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.

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 …

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 …

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 …

Activation of the adaptive immune defenses is triggered by pathogen-specific molecular structures called antigens.

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.