title: Variations in maternal plasma levels of human placental lactogen (HPL) in normal pregnancy and labour.
mesh_terms: D002940:Circadian Rhythm; D005260:Female; D005318:Fetal Heart; D006339:Heart Rate; D006801:Humans; D007751:Labor, Induced; D007743:Labor, Obstetric; D009119:Muscle Contraction; D005082:Physical Exertion; D010928:Placental Lactogen / Q000097:blood*; D011247:Pregnancy; D011863:Radioimmunoassay; D012890:Sleep; D013997:Time Factors; D014599:Uterus / Q000502:physiology
chemical_list: D010928:Placental Lactogen