Hazum, E Morphine in cow and human milk: could dietary morphine constitute a ligand for specific morphine (mu) receptors? [electronic resource] - Science (New York, N.Y.) Aug 1981 - 1010-2 p. digital Publication Type: Journal Article ISSN: 0036-8075 Standard No.: 10.1126/science.6267691 doi Subjects--Topical Terms: AnimalsCattleDietFemaleHumansLigandsMilk--analysisMilk, Human--analysisMorphine--analysisReceptors, Opioid--metabolism