Assertion: different estrogen | /r/HasProperty | extracted
Facets:
value: from pregnant horse urine
type: LOCATION
Source sentences:
text: Since about half of the estrogen in Premarin is estrone (which is natural to humans) and the other half consists of a different estrogen that is natural only to horses and is extracted from pregnant horse urine, it is natural, strictly speaking, only if you are half horse and half human!