antigen
an tuh juhn
- n any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies)
- Take the prostate-specific-antigen (PSA) test for prostate cancer, for example.
- The researchers believe that the antigen influences the molecule to assume a modified structure in the flask, just as it would in the blood stream.
- The antigen, chemically removed from its microscopic bacterial source, is being distributed to investigating doctors.