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Progesterone Antagonist
Definition 1
A substance that blocks the activity of a progestin. (NCI Thesaurus)
Definition 2
A substance that prevents cells from making or using progesterone (a hormone that plays a role in the menstrual cycle and pregnancy). Antiprogestins may stop some cancer cells from growing and they are being studied in the treatment of breast cancer. An antiprogestin is a type of hormone antagonist. (NCI Dictionary)
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