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It is suggested that this might be due to the difficulty of determining zygosity on the one hand and identifying discordance or concordance on the other. This case is presented as an example of this difficulty; it is discordant with respect to anencephaly, but concordant in the sense of \u201cdysraphic\u201d disturbances.<\/jats:p>","DOI":"10.1002\/ajmg.1320210403","type":"journal-article","created":{"date-parts":[[2005,6,11]],"date-time":"2005-06-11T19:59:25Z","timestamp":1118519965000},"page":"631-635","source":"Crossref","is-referenced-by-count":6,"title":["Anencephaly in one monoamniotic\u2010monochorionic twin and encephalocele in the other"],"prefix":"10.1002","volume":"21","author":[{"given":"Barbara","family":"Putz","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Helga","family":"Rehder","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John M.","family":"Opitz","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"James F.","family":"Reynolds","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2005,6,3]]},"reference":[{"key":"e_1_2_1_2_1","first-page":"437","article-title":"Contribution a l'\u00e9tiologie de l'anencephalie par l'\u00e9tude des jumeaux","volume":"98","author":"de Bellefeuille P","year":"1969","journal-title":"Union Med Can"},{"key":"e_1_2_1_3_1","first-page":"135","article-title":"Lessons from multiple pregnancies in mammals","volume":"69","author":"Benirschke K","year":"1981","journal-title":"Prog Clin Biol Res"},{"key":"e_1_2_1_4_1","volume-title":"Handbuch der Speziellen Pathologischen Anatomie und Histologie","author":"Benirschke K","year":"1967"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1056\/NEJM197306142882406"},{"key":"e_1_2_1_6_1","first-page":"165","article-title":"Monoamniotic twin pregnancy","volume":"27","author":"Colburn DW","year":"1982","journal-title":"J Reprod Med"},{"key":"e_1_2_1_7_1","first-page":"29","article-title":"Twinning and anencephalus occurrence in relation to fetus\u2010fetus interaction","volume":"30","author":"Elwood JM","year":"1976","journal-title":"Br J Prev Soc Med"},{"key":"e_1_2_1_8_1","volume-title":"Pathology of the Placenta. 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