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.

Dec 5, 2016 · Antigens are often rodlike structures that stick out from the surface of an invading organism—usually a bacterium or a virus—and allow it to attach itself to cells in the invaded …

Sep 5, 2025 · Antigens are molecules that trigger an immune response. They help the body recognize self and non-self to invaders can be neutralized.

Oct 25, 2023 · An antigen is something which stimulates an immune response and binds to an antibody or T-cell receptor. An antigen is a molecule or particle, often found on the surface of …

May 24, 2023 · What is an antigen? A simple definition is that an antigen refers to any substance that triggers an immune response. This response is intended to naturally protect the body from …

Aug 5, 2025 · Antigens are molecular structures, often proteins or polysaccharides, that are found on the surface of pathogens such as viruses, bacteria, and fungi. But they can also be found …

An antigen is a substance that causes an immune response in the body—specifically, an antigen causes the body to produce antibodies.

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 …