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MedicineMaternal HealthObstetricsMaternal-fetal MedicineReproductive MedicinePlacental BiologyPlacental DevelopmentPlacental PhysiologyPregnancyPregnancy BiologyPregnancy Physiology
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Shengsong Xie, Brooks Low, Robert J. Nagel et al. · Proceedings of the National Academy of Sciences · 1991 · 243 citations