{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,4]],"date-time":"2026-09-04T03:11:20Z","timestamp":1788491480666,"version":"build-2803163510"},"reference-count":28,"publisher":"Cambridge University Press (CUP)","issue":"2","license":[{"start":{"date-parts":[[2018,3,15]],"date-time":"2018-03-15T00:00:00Z","timestamp":1521072000000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Twin Res Hum Genet"],"published-print":{"date-parts":[[2018,4]]},"abstract":"<jats:p>This article begins with the story of a 51-year-old Los Angeles, California man, Justin Goldberg, whose daughter caught a glimpse of his striking look-alike at a popular market. Many people have so-called doppelg\u00e4ngers, but this occurrence is especially intriguing \u2014 the individual in question, born in New York City in the mid-1960s to an unwed mother, was an adoptee placed by the Louise Wise Adoption Agency. This agency, under the guidance of a prominent psychiatrist, decided to place twins in separate homes. Some of these twin children were part of a controversial child development study that was hidden from them and their parents. Next, recent and current twin research on heart transplantation, distinguishing monozygotic co-twins, twin conceptions via oocyte donation and factors affecting craniofacial traits are summarized. The article concludes with highlights on twins in the media, specifically, a triplet delivery in the United Kingdom, self-concept and consciousness in conjoined twins, Colombian twin trainers, skin grafting to save an identical co-twin, lack of physical flaws in Dolly the cloned sheep, possible opposite-sex conjoined twins, and the passing of the remaining twin from the world's longest separated pair.<\/jats:p>","DOI":"10.1017\/thg.2018.4","type":"journal-article","created":{"date-parts":[[2018,3,15]],"date-time":"2018-03-15T06:19:13Z","timestamp":1521094753000},"page":"155-162","source":"Crossref","is-referenced-by-count":2,"title":["A Possible Twin: The 1960s Twin Study Revisited\/Twin Research: Twin-to-Twin Heart Transplantation; Distinguishing Monozygotic Twins; Twin Conceptions via Oocyte Donation; Factors Affecting Craniofacial Traits\/In the Media: Triplet Delivery in the UK; Conjoined Twins and the Concept of Self; Colombian Twin Trainers; Skin Grafting to Save an Identical Co-Twin; Lack of Physical Flaws in Dolly the Cloned Sheep; Possible Conjoined Twins of Opposite-Sex; Passing of the Remaining Twin From the World's Longest Separated Pair"],"prefix":"10.1017","volume":"21","author":[{"given":"Nancy L.","family":"Segal","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2018,3,15]]},"reference":[{"key":"S183242741800004X_ref027","first-page":"17","article-title":"Dolly turns out to have no flaw","author":"Whipple","year":"2017","journal-title":"London Times"},{"key":"S183242741800004X_ref023","volume-title":"Accidental brothers: The story of twins exchanged at birth and the power of nature and nurture","author":"Segal"},{"key":"S183242741800004X_ref020","doi-asserted-by":"publisher","DOI":"10.1016\/j.paid.2014.09.017"},{"key":"S183242741800004X_ref016","volume-title":"Identical strangers: A memoir of twins separated and reunited","author":"Schein","year":"2007"},{"key":"S183242741800004X_ref012","volume-title":"Nature's thumbprint: The new genetics of personality","author":"Neubauer","year":"1990"},{"key":"S183242741800004X_ref011","doi-asserted-by":"publisher","DOI":"10.1002\/ajmg.a.32951"},{"key":"S183242741800004X_ref010","unstructured":"Harris M. 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