{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,14]],"date-time":"2026-09-14T11:53:59Z","timestamp":1789386839959,"version":"build-2803163510"},"reference-count":41,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2005,6,7]],"date-time":"2005-06-07T00:00:00Z","timestamp":1118102400000},"content-version":"vor","delay-in-days":3949,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Am. J. Med. Genet."],"published-print":{"date-parts":[[1994,8,15]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>We have studied omphalopagus conjoined twins with a diamniotic monochorionic placenta. Although conjoined twins usually present in a single amniotic sac, one other example of diamniotic placenta has been reported in omphalopagus twins [Weston et al., 1990: Am J Med Genet 37:558\u2013561]. Most theories concerning the pathogenesis of conjoined twinning exclude the possibility of diamniotic placentation. However, Spencer [1992: Teratology 45:591\u2013602] recently elaborated a model for conjoined twinning based on duplication of organizing centers (primitive streaks) during gastrulation. We have considered the fate of embryonic membranes according to this model of omphalopagus twinning and show that diamniotic placentation is a predictable outcome. \u00a9 1994 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/ajmg.1320520213","type":"journal-article","created":{"date-parts":[[2005,6,11]],"date-time":"2005-06-11T17:16:50Z","timestamp":1118510210000},"page":"188-195","source":"Crossref","is-referenced-by-count":31,"title":["Diamniotic placentation associated with omphalopagus conjoined twins: Implications for a contemporary model of conjoined twinning"],"prefix":"10.1002","volume":"52","author":[{"given":"Raj P.","family":"Kapur","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rhona M.","family":"Jack","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joseph R.","family":"Siebert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2005,6,7]]},"reference":[{"key":"e_1_2_1_2_1","first-page":"576","article-title":"\u00dcber einen Doppel\u2010embryo vom Huhne am Anfange des dritten Tages der Bebr\u00fctung","volume":"2","author":"von Baer KE","year":"1827","journal-title":"Archiv f\u00fcr Anatomie und Physiologie"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-1-4757-4193-3"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/0012-1606(86)90059-X"},{"key":"e_1_2_1_5_1","article-title":"Lettre \u00e0 Malacarne","volume":"4","author":"Bonnet R","year":"1779","journal-title":"Oeuvres Compl\u00e8tes"},{"key":"e_1_2_1_6_1","first-page":"389","article-title":"The morphological theory of monochorionic twins as illustrated by a series of supposed early twin embryos of the pig","volume":"33","author":"Corner GW","year":"1922","journal-title":"Bull Johns Hopkins Hosp"},{"key":"e_1_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.5962\/bhl.title.45945"},{"key":"e_1_2_1_8_1","first-page":"160","article-title":"Entwicklungsmechanische Studien","volume":"53","author":"Driesch H","year":"1892","journal-title":"Z Wiss Zool"},{"key":"e_1_2_1_9_1","unstructured":"DuverneyJG (1706): Observations sur deux enfants joints ensemble. 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