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Tags: 1998, Aging/*metabolism, Ala(2)-MePhe(4)-Gly(5)-, Animals, Brain research, Crisp T, delta/antagonists & inhibitors/*metabolism, Enkephalin, Enkephalins/metabolism, Gordon T L, Hoskins D L, Inbred F344, Male, mu/agonists/*metabolism, Naltrexone/analogs & derivatives/metabolism, Narcotic Antagonists/metabolism, Opioid, Radioligand Assay, Rats, Receptors, Spinal Cord/*metabolism
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