| Unlike most animals, many fish produce two forms of a gene responsible for the enzyme aromatase, which in turn makes estrogen. |
| Fat cells are a rich source of the aromatase enzyme that converts testosterone to estrogen. |
| A group of estrogen-blocking drugs called aromatase inhibitors have proven effective in preventing breast cancer from recurring after surgery. |
| Chrysin, derived from Passiflora caerulea plants, does appear to block aromatase enzymes from converting testosterone to estrogen. |
| Researchers are investigating whether aromatase inhibitors can prevent breast cancer. |
| Letrozole disables an enzyme called aromatase, which the body needs to make estrogen. |
