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  • Title: Synergistic effect of human relaxin and progesterone on human myometrial contractions.
    Author: Beck P, Adler P, Szlachter N, Goldsmith LT, Steinetz BG, Weiss G.
    Journal: Int J Gynaecol Obstet; 1982 Apr; 20(2):141-4. PubMed ID: 6125435.
    Abstract:
    In an in vitro human myometrial strip system, both relaxin and progesterone can independently decrease the amplitude of spontaneous myometrial contractions. However, progesterone and relaxin synergize in this action. Doses of relaxin and progesterone which independently are ineffective, together inhibit myometrial contraction amplitude. Relaxin and progesterone are both products of the corpus luteum, a structure necessary for early pregnancy maintenance. The synergistic action of relaxin and progesterone in vitro suggests a similar in vivo physiologic effect in establishing uterine quiescence.
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