Assertion: birth control's hormone | /r/CreatedBy | the body
Facets:
value: naturally
type: MANNER
value: during pregnancy
type: TEMPORAL
Source sentences:
text: Pincus and John Rock, an obstetrician, began working in secret to figure out if it was possible to use progesterone, a hormone produced by the body during pregnancy, to prevent pregnancy in women.
text: A synthetic form of progesterone that is similar to the hormone produced naturally by the body.