Monkey business

We’ve known that prostate-specific antigen (PSA) is not specific to the prostate. Work by Diamandis, Hu, and others showed it expressed in such far flung places as the glands of Littre and fetal thymus. Indeed, it is expressed in human milk. Now comes news that PSA is not specific to humans. Investigators have shown that PSA is expressed in baboons and macaques (though not in marmosets). The “New” Prostate Cancer InfoLink, having taken the position that somewhere in the galaxy must be a species other than human that makes PSA, is not surprised.

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