The placenta does not only act as the essential link between the developing embryo and its mother. Unexpectedly, it is also a source of serotonin — a neurotransmitter that is crucial for embryonic brain development. See Letter p.347
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McKay, R. Remarkable role for the placenta. Nature 472, 298–299 (2011). https://doi.org/10.1038/472298a
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DOI: https://doi.org/10.1038/472298a
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