A serotonin shield rather than a source: Revisiting the placenta's critical role in the health of babies

The placenta has long been thought to produce serotonin during pregnancy. But in a new study, Yale researchers shatter the deep-rooted hypothesis—and show that the placenta doesn't produce serotonin but instead regulates its delivery to the embryo and fetus. They found that serotonin comes from the pregnant parent, with the placenta acting as a "serotonin shield" that controls how much reaches the embryo and fetus.

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