No abstract available
Publication types
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Analgesics, Opioid / pharmacology*
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Animals
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Animals, Newborn
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Behavior, Animal / drug effects
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Dose-Response Relationship, Drug
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Drug Administration Schedule
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Drug Tolerance*
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Male
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Morphine / administration & dosage
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Morphine / adverse effects
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Morphine / pharmacology*
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Pain Measurement / drug effects
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Pain Threshold / drug effects
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Rats
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Rats, Sprague-Dawley
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Rats, Wistar
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Receptors, Opioid / drug effects
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Receptors, Opioid / metabolism
Substances
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Analgesics, Opioid
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Receptors, Opioid
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Morphine