No abstract available
MeSH terms
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Animals
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Avoidance Learning / drug effects
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Behavior, Animal / drug effects
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Conditioning, Classical / drug effects
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Drug Interactions
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Endorphins / physiology*
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Female
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Habituation, Psychophysiologic / drug effects
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Memory / drug effects*
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Memory / physiology
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Morphine / pharmacology*
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Naloxone / pharmacology*
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Rats
Substances
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Endorphins
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Naloxone
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Morphine