Via boingboing.net -
One person outside: But two people "inside": That's the gist of the chimera, a human being who carries the DNA (and sometimes the body parts) for two. It sounds crazy, but it happens. In fact, doctors think it probably happens more often than we realize. Unless there were some reason to test the DNA from cells in different parts of your body, you could easily be a chimera and never know it.
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I recently saw the story of Lydia Fairchild on the Discovery Channel, which peaked my interest in human chimerism.
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