plasma concentrations of immunoreactive melatonin , estradiol , progesterone , follicle stimulating hormone ( fsh ) , and beta-human chorionic gonadotropin ( beta hcg ) were studied between 1000 and 1230 h in 105 chinese females during six periods of normal pregnancy and 1-5 min after normal delivery .
C0033308
progesterone
C0032961
pregnancy