A chimera is a composite of multiple individuals existing in one host body. You can find them in plants, animals and even humans. In the case of organ transplantation or something like that, where you have a large tissue from someone that is a completely different individual, you can consider that person a chimera.
Fetuses leave cells behind in their parents' bodies, where they braid themselves into tissues, and remain, for years. What are they doing in there?
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