antigen -
any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies)
substance the real physical matter of which a person or thing consists; "DNA is the substance of our genes"
immunology the branch of medical science that studies the body's immune system
immunizing agent,
immunogen any substance or organism that provokes an immune response (produces immunity) when introduced into the body
agglutinogen any substance that acts as an antigen to cause agglutinin production
fetoprotein,
foetoprotein any of several antigens that occur naturally in the fetus and sometimes in adults with cancer
anatoxin,
toxoid a bacterial toxin that has been weakened until it is no longer toxic but is strong enough to induce the formation of antibodies and immunity to the specific disease caused by the toxin; "diphtheria toxoid"
antigen -
A substance that induces an immune response, usually foreign.
Wikipedia
An antigen is a molecule recognized by the immune system. Originally the term came from antibody generator and was a molecule that binds specifically to an antibody, but the term now also refers to any molecule or molecular fragment that can be bound by a major histocompatibility complex (MHC) and presented to a T-cell receptor. "Self" antigens are usually tolerated by the immune system; whereas "Non-self" antigens are identified as intruders and attacked by the immune system.
OmegaWiki Dictionary
Ω
antigen Any substance that can stimulate the body to produce antibodies against it. Antigens include bacteria, viruses, pollen, and other foreign materials. (source AIDSinfo)
