AZD2281
Azedra
AZD6244
Azoospermia
AZQ
Azygos vein
Azoxymethane
AZT
AC-T regimen
Acolbifene hydrochloride
AC-Taxol regimen
Acneiform rash
Acid-base equilibrium
Acid-base balance
Acid
Acquired thrombotic thrombocytopenic purpura
Acridine carboxamide
Acromegaly
AC-T
Acrylonitrile 

Antigen

Meaning of Antigen

Any substance that causes the body to make an immune response against that substance. Antigens include toxins, chemicals, bacteria, viruses, or other substances that come from outside the body. Body tissues and cells, including cancer cells, also have antigens on them that can cause an immune response. These antigens can also be used as markers in laboratory tests to identify those tissues or cells.

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