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 …

An antigen is anything recognized by your immune system. Antigen tests diagnose viral infections, monitor certain illnesses or look for stem cell compatibility.

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.

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 …

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 …

Antigens play a role in the immune system, acting as molecular markers that trigger an immune response. These substances help distinguish between self and non-self entities within the …

May 24, 2023 · 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 harmful …

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