No abstract available
MeSH terms
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Aging / physiology
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Analgesics, Opioid / pharmacology
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Animals
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Humans
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Rats
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Receptors, Opioid / drug effects
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Receptors, Opioid / physiology*
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Spinal Cord / growth & development*
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Spinal Cord / physiology*
Substances
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Analgesics, Opioid
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Receptors, Opioid