title: Opioid peptides: differentiation by radioimmunoassay and radioreceptor assay.
mesh_terms: D000818:Animals; D001923:Brain Chemistry; D002417:Cattle; D004723:Endorphins / Q000032:analysis*; D004745:Enkephalins / Q000032:analysis*; D011863:Radioimmunoassay / Q000379:methods*; D011869:Radioligand Assay / Q000379:methods*; D051381:Rats
chemical_list: D004723:Endorphins; D004745:Enkephalins