prostate specific antigen
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Related to prostate specific antigen: Prostate Enlargement
prostate specific antigen[¦prä‚stāt spə‚sif·ik ′ant·i·jən]
A glycoprotein with 240 amino acids that is expressed exclusively by human prostate epithelial cells and that exhibits protease activity; elevated levels in the blood are detected in individuals with prostate cancer. Abbreviated PSA.