People who have carried fetuses at some point in their lives do seem to be at higher risk for autoimmune diseases. Researchers were kind of looking at micro-cramera and they were thinking like, okay, people who are getting pregnant are bringing kind of foreign cells into themselves that look a lot like them.
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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