Since twin loss occurs in an estimated 21 to 30% of multiple-fetus pregnancies, it's possible that many people are chimeras, but may never find out. Doctors said her extra DNA most likely came from a fraternal twin - and in 2002 her story became a report in the New England Journal of Medicine. Tests said she wasn't the biological mother of her children, but it turned out that the DNA in her blood was different than the DNA in her ovaries. Genetic experts believed he was a human chimera, and he had absorbed some of his DNA from a fraternal twin's embryo, BuzzFeed reported.Ī woman named Karen Keegan wound up in a similar situation. ![]() In 2015, a man from Washington took a cheek swab paternity test that said he was technically his son's uncle, not his father. Further testing revealed that the man had different DNA in his saliva and his sperm.
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