No abstract available
MeSH terms
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Analgesia*
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Animals
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Dose-Response Relationship, Drug
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Endorphins / pharmacology*
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Enkephalins / pharmacology*
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Morphine / pharmacology*
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Naloxone / pharmacology
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Nociceptors / drug effects
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Rats
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Receptors, Opioid / drug effects*
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Spinal Cord / drug effects*
Substances
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Endorphins
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Enkephalins
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Receptors, Opioid
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Naloxone
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Morphine