pregnant women undergoing cesarean section in the absence of labor show constant beta-lipotropin and beta-endorphin concentrations both before and after fetal extraction , both values being significantly lower than those found at delivery after spontaneous labor . beta-endorphin neonatal levels were significantly higher than in the respective mothers and were in the same range as those of infants born through vaginal delivery .
C0022864
labor
C0474461
spontaneous labor