Question

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psa is an abbreviation that stands for \boxed{} -specific antigen.
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Explanation:

In the field of medicine (a subfield of Natural Science), PSA is a well - known abbreviation. It stands for Prostate - specific antigen, which is a protein produced by cells of the prostate gland. This antigen is often used as a biomarker in the diagnosis and monitoring of prostate - related conditions, especially prostate cancer.

Answer:

Prostate