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|Noun||1.||foetoprotein - any of several antigens that occur naturally in the fetus and sometimes in adults with cancer|
AFP, alpha fetoprotein, alpha foetoprotein - an abnormally large amount of this fetoprotein in the fetus can signal an abnormality of the neural tube (as spina bifida or anencephaly)
antigen - any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies)