title: The infleunce of fetal sex on plasma progesterone levels.
mesh_terms: D000818:Animals; D002247:Carbon Isotopes; D005260:Female; D005333:Fetus / Q000378:metabolism*; D005838:Genotype; D005865:Gestational Age; D000882:Haplorhini; D008251:Macaca; D008297:Male; D011247:Pregnancy; D011374:Progesterone / Q000097:blood* / Q000378:metabolism; D011485:Protein Binding; D012737:Sex Factors; D014316:Tritium; D014469:Umbilical Arteries / Q000032:analysis; D014471:Umbilical Veins / Q000032:analysis
chemical_list: D002247:Carbon Isotopes; D014316:Tritium; D011374:Progesterone