Microchimerism isn't just about fetuses passing cells to their parents. It's actually a lot more complicated because it goes both ways. So not only am I kind of giving you my cells, but when I was in your womb, you gave me some of your cells as well. The big challenge is very simple. There are all these little chimerical cells that are very hard to track.
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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