Identical twins do not always have identical genes, study shows – Business Insider – Business Insider

For decades, researchers believed that monozygotic twins — twins that form when a fertilized egg splits in two — were born with essentially the same genetic codes. Hence the common name for such pairs: identical twins.
But according to new research published in Nature, identical twins aren’t necessarily genetically identical. Rather, their genomes often differ in small but significant ways from the very first week of development.
For the study, scientists at deCODE genetics, an Icelandic biopharmaceutical…

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