No abstract available
MeSH terms
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Animals
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Codeine / pharmacology
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Conditioning, Operant / drug effects*
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Dextropropoxyphene / pharmacology
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Haplorhini
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Heroin / pharmacology
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Macaca mulatta
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Narcotics / pharmacology*
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Pentazocine / pharmacology
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Reinforcement Schedule
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Self Administration
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Time Factors
Substances
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Narcotics
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Heroin
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Pentazocine
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Dextropropoxyphene
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Codeine