title: Humoral endorphin in human body fluids during pregnancy.
abstract: The presence of an enkephalin-like substance ('humoral endorphin') in human maternal and cord blood, as well as in amniotic fluid, has been demonstrated in this study. Utilizing antibodies to leucine-enkephalin, it was found that the level of this substance in maternal and in cord blood remained stable during pregnancy whereas the concentration in amniotic fluid was significantly higher at mid-trimester than during labor at term.
mesh_terms: D000653:Amniotic Fluid / Q000032:analysis*; D002850:Chromatography, Gel; D004723:Endorphins / Q000032:analysis* / Q000097:blood; D005260:Female; D005312:Fetal Blood / Q000032:analysis*; D006801:Humans; D007743:Labor, Obstetric; D011247:Pregnancy; D011262:Pregnancy Trimester, Second
chemical_list: D004723:Endorphins