title: Direct isolation of beta-endorphin from plasma by column chromatography.
mesh_terms: D001769:Blood; D002850:Chromatography, Gel; D004723:Endorphins / Q000097:blood / Q000302:isolation & purification*; D005260:Female; D006801:Humans; D010920:Placenta; D011247:Pregnancy; D001615:beta-Endorphin
chemical_list: D004723:Endorphins; D001615:beta-Endorphin