Last year, researchers discovered that identical twins carry a molecular signature on their DNA that no one else has. ScienceMagArchives
Using blood and cheek cell samples, the researchers scanned the epigenomes of more than 3000 identical twins, as well as a comparable number of fraternal twins and some twins’ parents. They looked at 400,000 different places on each person’s genome. About 800 locations had. “It’s likely something established very early on that is propagated to subsequent cells,” van Dongen says.
Understanding the epigenetic changes and whether they are a cause or effect of an egg splitting will require lab studies using embryolike structures made from stem cells or early animal and human embryos , says Jeffrey Craig, a twin researcher at Deakin University, Geelong Waurn Ponds.
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