title: Isolation and identification of opioid peptides.
mesh_terms: D000313:Adrenal Medulla / Q000032:analysis; D000595:Amino Acid Sequence; D000818:Animals; D002417:Cattle; D002645:Chickens; D004723:Endorphins / Q000302:isolation & purification*; D004743:Enkephalin, Leucine / Q000302:isolation & purification; D004744:Enkephalin, Methionine / Q000031:analogs & derivatives / Q000302:isolation & purification; D004745:Enkephalins / Q000302:isolation & purification*; D011863:Radioimmunoassay / Q000379:methods; D013329:Structure-Activity Relationship
chemical_list: D004723:Endorphins; D004745:Enkephalins; D004744:Enkephalin, Methionine; D004743:Enkephalin, Leucine; C039700:adrenorphin