No abstract available
MeSH terms
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Animals
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Codeine*
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Conditioning, Psychological*
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Equipment and Supplies*
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Haplorhini*
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Injections, Intravenous*
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Meperidine*
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Methadone*
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Morphine Dependence*
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Nalorphine*
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Opioid-Related Disorders*
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Rats
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Substance-Related Disorders*
Substances
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Meperidine
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Nalorphine
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Methadone
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Codeine