there was a woman who was a chimera and didnt know it. She had two sets on DNA in her body and the dominant DNA set did not match her children. There was a custody issue, and she couldnt prove scientifically that her children were hers even though she had video of delivering them. She did a DNA test and it didnt match! Eventually they found the matching DNA in some obscure part of her body and that was the ONLY place they found it. I wish I could remember more about it, I'd post a youtube link or news article.
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