No abstract available
MeSH terms
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Analgesics, Opioid / administration & dosage*
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Analgesics, Opioid / pharmacology
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Animals
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Behavior, Animal / drug effects
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Brain
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Brain Stem
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Central Nervous System
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Drug Tolerance
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Injections
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Injections, Spinal
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Mesencephalon
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Mice
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Microinjections
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Morphine / administration & dosage
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Morphine / pharmacology
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Pain
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Primates
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Rabbits
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Rats
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Receptors, Opioid
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Sensation / drug effects
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Spinal Cord
Substances
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Analgesics, Opioid
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Receptors, Opioid
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Morphine