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  • Title: Effects of antifertility estrogens and progestins on the endometrial surface of early pregnant rats. A scanning electron microscopic study.
    Author: Koch M, Stracke R, Peschke T.
    Journal: Exp Clin Endocrinol; 1985 Apr; 85(2):138-46. PubMed ID: 3926520.
    Abstract:
    Two estrogens, mestranol and 3-methoxy-14 beta, 15 beta-methyleneestra-1,3,5(10)triene-17 beta-ol (STS 593), and two progestins, levonorgestrel and 17 alpha-cyanomethyl-17 beta-hydroxyestra-4,9(10)-diene-3-one (STS 557), all having antifertility properties in rodents, were examined for their effects on the uterine luminal surface of early pregnant rats. Scanning electron microscopic studies showed that there are clear qualitative differences between the effects of estrogens and progestins on both morphology and microvillous pattern of the endometrial surface while STS 557 showed intermediate effects. The results are discussed with respect to the anti-implantation activity of steroids.
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