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, 11:35, 3 July 2008
== Aetiology ==
* Results from sexual modification of a '''female twin''' by the in-utero exchange of blood from a male fooetus.
* Freemartin is XX genetic female, but becomes an XX/XY chimera.
== Diagnosis ==
== Morphology ==
* Gonads range from modified Ovaries to structures resembling Testes which are intra-abdominal and do not descend through the inguinal canal (Cryptorchid).