1. In pigs, for example, retrieving healthy eggs and maintaining pregnancy was difficult, Ayares said. 2. Mifepristone works by counteracting progesterone, a hormone that is needed to maintain a pregnancy. 3. Progesterone is essential to maintaining pregnancy, and blocking it leads to a sloughing within the uterus and bleeding that detaches the fetus. 4. Progesterone is essential to maintaining pregnancy, and blocking it leads to a sloughing of the uterus and bleeding that detaches the fetus. 5. The pills block progesterone, a hormone essential for maintaining pregnancy. 6. Mifepristone blocks action of a hormone essential for maintaining pregnancy. 7. The pill blocks action of a hormone essential for maintaining pregnancy. 8. Women swallow mifepristone, which blocks a hormone essential for maintaining pregnancy. |