What Is Prostate-Specific Antigen? Your prostate is a gland that makes seminal fluid, which nourishes and transports your sperm when you ejaculate. It's about the size of a walnut and surrounds your ...
Prostate-specific antigen (PSA) is a protein that is secreted by the cells of the prostate gland and is found in semen, the medium that carries sperm. PSA is the substance that liquefies semen, ...
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