The existence of a placental clock controlling the term of pregnancy has long been hypothesized. Now scientists may have uncovered what makes it tick (pages 460–463).
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Challis, J. CRH, a placental clock and preterm labour. Nat Med 1, 416 (1995). https://doi.org/10.1038/nm0595-416
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DOI: https://doi.org/10.1038/nm0595-416
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