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biological

Judged: two independent readers; copy check clear.

progesterone

progesterone Progesterone is the main progestational steroid hormone, produced chiefly by the corpus luteum and placenta.

Progesterone is the main progestational steroid hormone, produced chiefly by the corpus luteum and placenta. It acts on the uterus, mammary glands, and brain, and is important for embryo implantation, maintaining pregnancy, mammary tissue development for milk production, and as a building block for other steroid hormones.