I dunno, are you familiar with the medical term ‘chameleon’? One famous case was a woman who was going to doante a kidney to her son, only to discover that apparently she was not a DNA match. Turns out she had ‘absorbed’ a sibling very early in gestation and had the DNA of herself and her sibling throughout her body ... a sister lung, her own liver, etc.
Catch that ... the term is chimera, not chameleon. ... Must stop trying to do three things at the same time.
“‘chameleon’”
I think you meant “chimera”.
The startling case of "chimera" that I recall was a woman who became involved in a child custody conflict and failed a DNA test, indicating that she was not the mother of her children. There had been people present at the birth, I think, who swore to her maternity. Nevertheless the government was prepared to take away her children.
Later more exhaustive testing revealed that the cells in her body had different DNA depending on location in the body. I don't recall any explanation other than absorption of a fraternal twin.