Tvilling: Forskelle mellem versioner

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== Eksterne henvisninger ==
{{Commonscat|Twins}}
* [http://www.bogenomtvillinger.dk Bogen om Tvillinger 0-10 år]
* [http://www.uge-for-uge.dk Uge-for-uge-kalender – om tvillingegraviditeten]
* [http://www.world-science.net/othernews/050617_jumpgenefrm.htm June 17, 2005, World Science: Random “jumping genes” give our brains uniqueness, researchers find] Citat: "...this may explain the longstanding puzzle of why no two brains look the same, not even those of otherwise identical twins..."