No abstract available
MeSH terms
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Animals
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Drug Tolerance
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Dynorphins
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Endorphins / pharmacology*
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In Vitro Techniques
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Male
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Mice
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Muscle Contraction / drug effects*
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Muscle, Smooth / drug effects*
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Narcotics / pharmacology
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Receptors, Opioid / drug effects*
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Vas Deferens / drug effects
Substances
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Endorphins
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Narcotics
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Receptors, Opioid
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Dynorphins