* 5-alpha-reductase - 5α-reductase --- converts hormones into much powerful dihydro forms.
* Corpus Luteum --- a temporary organ that creates progesterone and relaxin. It's purpose is to signal the body to keep the egg or fetus. There is a positive feedback loop between the pituitary gland to release prolactin and the Corpus Luteum, to signal the body not to start menstruation. The corpus luteum dies by the start of menstruation and it eventually disintegrates within the ovary.
* Corpus Luteum --- a temporary organ that creates progesterone and relaxin. It's purpose is to signal the body to keep the egg or fetus. There is a positive feedback loop between the pituitary gland to release prolactin and the Corpus Luteum, to signal the body not to start menstruation. The corpus luteum dies by the start of menstruation and it eventually disintegrates within the ovary.