New research hints at why some twins are identical.
Derek Dolro/PexelsIdentical twins are a scientific enigma: No one knows why a fertilized human egg will sometimes split into two genetically identical embryos—but new research suggests that epigenetics have something to do with it.
To investigate whether epigenetics play a role in identical twin development, an international team of researchers analyzed the genomes of more than 6,000 individuals around the world, including identical twins, fraternal twins, and non-twin family members. They looked at 450,000 sites across their DNA to identify patterns of epigenetic differences, and found that identical twins had the same signature DNA tags at 834 points.
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