Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

a protein seen in the blood plasma of developing children while inutero and cultivated by a few growths in mature people. Concerning mice, rats, and the like, alpha- fetoprotein adheres estrogens and blocks them from penetrating the human brain, thereby commanding sexual distinction. With respect to mature human beings, gauging of alpha-fetoprotein is recommended to establish liver cancer.

ALPHA-FETOPROTEIN (A-FETOPROTEIN AFP): "Alpha-fetaprotein can tell doctors the gender, paternity, and lung maturity of a baby while inutero."

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