behavior/neurological
• mice treated with morphine exhibit greater dose-dependent antinociceptive response compared with similarly treated wild-type mice
• however, acute morphine tolerance is retained
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• antinociception tolerance to etonitazene is reduced compared to in wild-type mice
• DAMGO-treated mice fail to develop antinociception tolerance unlike similarly treated wild-type mice
• however, tolerance to morphine is normal
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• in mice treated with morphine or fentanyl
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