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When a woman is ready to deliver a baby, a complex series of changes take place in the body to prepare for labor and birth. Most of those changes are triggered by hormones, including relaxin.

Relaxin is a hormone secreted in the ovary by the corpus luteum. When a woman is pregnant, the placenta will also release the hormone, as will the uterine lining. Men also have relaxin, which comes from the prostate gland and is found in semen, but in men it does not circulate in the blood.