Female prostate??? Who'd have thought it?

This makes for interesting reading.

www.utoronto.ca/acdclab/pubs/PM/9586671.pdf

This suggests other tissues in the body can produce PSA and that, even without a prostate, a total zero may never be possible.
(I have read elsewhere about the forensic implications ie that if PSA is is not possible to say with certainty that it must have come from a man)
Alf