No abstract available
MeSH terms
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Analgesia*
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Animals
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Drug Synergism
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Drug Tolerance
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Injections, Intraventricular
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Male
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Morphine / pharmacology
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Nerve Tissue Proteins / pharmacology*
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Oligopeptides / pharmacology
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Oxytocin / pharmacology
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Peptides / administration & dosage
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Peptides / pharmacology*
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Rats
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Time Factors
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beta-Lipotropin / administration & dosage
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beta-Lipotropin / pharmacology
Substances
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Nerve Tissue Proteins
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Oligopeptides
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Peptides
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Oxytocin
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Morphine
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beta-Lipotropin