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Tags: 1994, 5)-, Aging/*physiology, Ala(2)-MePhe(4)-Gly(5)-, Analgesics, Animals, Chinrock K M, Crisp T, D-Penicillamine (2, Dayal B, delta/agonists, Dose-Response Relationship, Drug, Enkephalin, Enkephalins/administration & dosage/pharmacology, Hoskins D L, Hot Temperature, Inbred F344, Injections, Male, mu/agonists, Neurobiology of aging, Nociceptors/*drug effects, Opioid, Opioid/administration & dosage/*pharmacology, Pain Measurement/drug effects, Rats, Receptors, Spinal, Spinal Cord/*physiology, Stafinsky J L, Uram M
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