title: Development and validation of a sensitive radioimmunoassay for naturally occurring beta-endorphin-like peptides in human plasma.
mesh_terms: D007611:Aprotinin; D003429:Cross Reactions; D004723:Endorphins / Q000097:blood*; D006801:Humans; D008832:Microchemistry; D010455:Peptides / Q000097:blood*; D011863:Radioimmunoassay / Q000379:methods
chemical_list: D004723:Endorphins; D010455:Peptides; D007611:Aprotinin