No abstract available
Publication types
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Comparative Study
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Animals
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Endorphins / pharmacology*
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Enkephalin, Methionine* / analogs & derivatives*
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Enkephalins / pharmacology*
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Guinea Pigs
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Male
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Mice
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Mice, Inbred ICR
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Morphine / pharmacology*
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Morphine Derivatives / pharmacology
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Peptides / pharmacology*
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Rats
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Receptors, Opioid / physiology*
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Species Specificity
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Vas Deferens / drug effects*
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beta-Endorphin
Substances
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Endorphins
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Enkephalins
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Morphine Derivatives
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Peptides
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Receptors, Opioid
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Enkephalin, Methionine
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beta-Endorphin
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enkephalinamide-Met, Ala(2)-
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Morphine
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normorphine