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Pregnancy outcome was determined on day 15 of gestation, when the number of implantations and resorptions were calculated relative to the number of ovulations, and fetuses were assessed for size and stage of development and morphological abnormalities. Preovulatory administration of clomiphene citrate caused decreased implantation rates and growth retardation of surviving fetuses, the degree of the effect being dependent on the dose and the time of drug injection relative to ovulation. The implantation rate was lowest, and the degree of fetal growth retardation highest, when clomiphene citrate was administered immediately before ovulation. An increased incidence of exencephaly was found in the fetuses of females injected with clomiphene citrate prior to ovulation. Transfer of blastocysts from treated mice to untreated fosters showed the effect of clomiphene citrate on implantation and fetal growth to be predominantly mediated through the female reproductive tract, rather than a direct effect on the embryo itself. Administration of clomiphene citrate in the preimplantational period resulted in complete inhibition of implantation, while the only effect when administration was after implantation was a slight reduction in fetal weight. These results indicate that preovulatory clomiphene citrate impairs uterine function, which has an indirect effect on the growth and development of the postimplantation embryo. \u00a9 1993 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/tera.1420470403","type":"journal-article","created":{"date-parts":[[2005,6,11]],"date-time":"2005-06-11T15:55:34Z","timestamp":1118505334000},"page":"263-273","source":"Crossref","is-referenced-by-count":18,"title":["Preovulatory administration of clomiphene citrate to mice causes fetal growth retardation and neural tube defects (exencephaly) by an indirect maternal effect"],"prefix":"10.1002","volume":"47","author":[{"given":"Marie","family":"Dziadek","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2005,6,2]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0015-0282(16)48069-6"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0015-0282(16)44051-3"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.3109\/00016347609158516"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1095\/biolreprod46.4.733"},{"key":"e_1_2_1_6_1","first-page":"387","article-title":"The effect of clomiphene citrate in early embryonic development, endometrium and implantation","volume":"1","author":"Birkenfeld A.","year":"1986","journal-title":"Hum. 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