No abstract available
MeSH terms
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Acetylcholine / pharmacology
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Analgesics / antagonists & inhibitors
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Analgesics / pharmacology*
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Animals
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Chickens
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Cyclazocine / pharmacology
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Dextropropoxyphene / pharmacology
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Electric Stimulation
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Esophagus / drug effects*
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Esophagus / innervation
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Heroin / pharmacology
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In Vitro Techniques
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Meperidine / pharmacology
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Methadone / pharmacology
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Morphinans / pharmacology
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Morphine / pharmacology
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Muscle Contraction / drug effects*
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Nalorphine / pharmacology
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Pentazocine / pharmacology
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Phenazocine / pharmacology
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Serotonin / pharmacology
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Tachyphylaxis / drug effects
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Time Factors
Substances
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Analgesics
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Morphinans
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Serotonin
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Heroin
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Morphine
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Meperidine
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Phenazocine
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Cyclazocine
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Acetylcholine
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Pentazocine
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Dextropropoxyphene
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Nalorphine
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Methadone