No abstract available
MeSH terms
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Animals
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Behavior, Animal / drug effects*
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Female
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Injections, Intraperitoneal
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Light
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Morphinans / administration & dosage
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Morphinans / pharmacology*
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Narcotic Antagonists / administration & dosage
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Narcotic Antagonists / pharmacology*
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Rats
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Reinforcement, Psychology*
Substances
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Morphinans
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Narcotic Antagonists