title: Nitrogen retention in pregnancy.
mesh_terms: D000293:Adolescent; D000328:Adult; D001724:Birth Weight; D001835:Body Weight; D004044:Dietary Proteins / Q000378:metabolism; D005243:Feces / Q000032:analysis; D005260:Female; D006801:Humans; D009584:Nitrogen / Q000378:metabolism* / Q000652:urine; D011247:Pregnancy
chemical_list: D004044:Dietary Proteins; D009584:Nitrogen