title: Forms of opioid peptides circulating in human blood: investigation with multiple radioimmunoassays and radioreceptor assay.
mesh_terms: D001667:Binding, Competitive; D004723:Endorphins / Q000097:blood*; D004744:Enkephalin, Methionine / Q000097:blood; D005260:Female; D009270:Naloxone / Q000494:pharmacology; D011863:Radioimmunoassay / Q000379:methods; D011869:Radioligand Assay / Q000379:methods; D001615:beta-Endorphin
chemical_list: D004723:Endorphins; D009270:Naloxone; D004744:Enkephalin, Methionine; D001615:beta-Endorphin