AMH and Mayer-Rokitansky-Kuster-Hauser syndrome: Aberrant expression of anti-Müllerian hormone (AMH) or its receptor, both involved in Müllerian duct regression [69] was hypothesized as a cause of MRKH syndrome [2,70]; however, this theory was later discounted as a result of contradictory findings from a study of 32 patients [71].