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.

Mar 30, 2023 · Antigens are molecules or molecular structures that are foreign to the body and generally induce an immune reaction in the form of the production of antibodies against them. …

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 …

Sep 4, 2024 · These molecules or substances are called antigens. Antigens (Ag) are substances that are foreign to the body and trigger an immune response, producing antibodies against …

Apr 9, 2024 · An antigen is a foreign molecule or substance that triggers an immune response in the body, leading to the production of antibodies.

Antigens can be defined as molecules that contain distinct sites or epitopes that are recognized and interact with various components of the immune system.