0timeforit 리트윗함

🧬 The post is correct but it only tells half the story. During pregnancy fetal cells cross the placenta and embed themselves into the mother's organs heart, liver, lungs, brain. They don't just pass through. They stay. A 2012 study examined the brains of 59 deceased older women and found the child's cells present in 63% of them, sometimes decades after the pregnancy ended. But the exchange goes both ways. A mother's cells also cross into the baby and have been detected in the child's brain and immune tissue persisting into adulthood. One in every million cells in your body right now is estimated to be your mother's, and considering the human body contains roughly 30 trillion cells, that is millions of her cells living inside you. When a mother's heart was injured in animal studies, her child's fetal cells migrated directly to the damage site and became heart tissue to help repair it. Biology encoded a repair system into the relationship before either of them understood what a relationship was.
📌 Source: PNAS 1996, Scientific American, Cincinnati Children's Hospital Research 2025

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