PiperazinesReceptors, Opioid, muReceptors, OpioidAnalgesics, OpioidReceptors, Opioid, deltaReceptors, Opioid, kappaOpioid PeptidesAscarisBuspironeNarcotic AntagonistsReceptors, sigmaDesigner DrugsNaloxoneOpioid-Related DisordersSerotonin Receptor AgonistsNaltrexoneAntinematodal AgentsStereoisomerismMolecular StructureStructure-Activity RelationshipReceptors, SerotoninEnkephalinsMitragynaPyronineEnkephalin, Ala(2)-MePhe(4)-Gly(5)-MorphineProchlorperazineSerotonin AntagonistsDose-Response Relationship, DrugReceptors, Serotonin, 5-HT1NarcoticsCyclization8-Hydroxy-2-(di-n-propylamino)tetralinProtein BiosynthesisEnkephalin, D-Penicillamine (2,5)-EndorphinsTrazodonePiperidinesRats, Sprague-DawleyDynorphinsCatatoniaRadioligand AssayDopamine Uptake InhibitorsBuprenorphineN-Methyl-3,4-methylenedioxyamphetamineEnkephalin, LeucineDelavirdineReceptors, Dopamine D3Drug InteractionsSerotoninEnkephalin, Leucine-2-AlanineKineticsAnthelminticsRNA, MessengerProtein Synthesis InhibitorsPyrantelSerotonin 5-HT1 Receptor AgonistsAscariasisReceptors, Dopamine D2Receptor, Serotonin, 5-HT1APainTrimetazidineDiprenorphineMolecular Sequence DataLigandsAnti-Anxiety AgentsDopamine Plasma Membrane Transport ProteinsTime FactorsRats, Wistarbeta-EndorphinTetrahydronaphthalenesCells, CulturedMagnetic Resonance SpectroscopyIsocyanatesMonoacylglycerol LipasesBisbenzimidazoleBenzeneacetamidesAnalgesicsMolecular ConformationBinding, Competitive3,4-MethylenedioxyamphetamineMorphinansDopamineCell LineDNADiethylcarbamazineDrug ToleranceEscherichia coliCycloheximideEnzyme InhibitorsRats, Inbred StrainsFentanylBase SequenceMethadoneTritiumCocaineDNA ReplicationPain MeasurementBehavior, AnimalMutation