relaxin

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re·lax·in

(rē-lak'sin),
A polypeptide hormone secreted by the corpora lutea of mammalian species during pregnancy. Facilitates the birth process by causing a softening and lengthening of the pubic symphysis and cervix; it also inhibits contraction of the uterus and may play a role in timing of parturition.
[relax + -in]

relaxin

(rĭ-lăk′sĭn)
n.
A female hormone secreted by the corpus luteum that helps soften the cervix and relax the pelvic ligaments in childbirth.

re·lax·in

(rĕ-lak'sin)
Polypeptide hormone secreted by the corpora lutea of mammalian species during pregnancy; facilitates birth process by softening and lengthening the pubic symphysis and cervix.

relaxin

A polypeptide found in the corpus luteum of various mammals that softens the neck of the womb (cervix) and relaxes the pubic joint of the pelvis to ease childbirth. Relaxin has not been proved to occur in humans.