Receptors, Opioid, muReceptors, SerotoninSerotoninSerotonin Receptor AgonistsReceptor, Serotonin, 5-HT2ASerotonin AntagonistsReceptor, Serotonin, 5-HT1AReceptors, OpioidAnalgesics, OpioidReceptors, Serotonin, 5-HT2Receptor, Serotonin, 5-HT2CReceptor, Serotonin, 5-HT1BSerotonin 5-HT2 Receptor AntagonistsReceptors, Opioid, deltaReceptor, Serotonin, 5-HT2BSerotonin Plasma Membrane Transport ProteinsReceptors, Serotonin, 5-HT3Receptors, Opioid, kappaMethysergideSerotonin AgentsReceptors, Serotonin, 5-HT1Serotonin Uptake InhibitorsSerotonin 5-HT1 Receptor AgonistsReceptors, Serotonin, 5-HT4Lysergic Acid DiethylamideSerotonin 5-HT2 Receptor AgonistsKetanserinOpioid PeptidesBuspironeSerotonin 5-HT1 Receptor AntagonistsTryptophan HydroxylaseMethiothepinSpiperoneSerotonergic NeuronsCyproheptadine8-Hydroxy-2-(di-n-propylamino)tetralinNarcotic AntagonistsDihydroergocristineReceptor, Serotonin, 5-HT1DReceptors, DopamineAmphetaminesNaloxoneSerotonin 5-HT3 Receptor AntagonistsSerotonin SyndromeBacteriophage muOpioid-Related Disorders5-HydroxytryptophanNaltrexoneNorfenfluramineFenclonineQuipazineFenfluramineReceptors, Biogenic AmineRadioligand AssayDose-Response Relationship, DrugEnkephalinsRitanserinRaphe NucleiEnkephalin, Ala(2)-MePhe(4)-Gly(5)-Rats, Sprague-DawleyPiperazinesErgolinesHallucinogensMorphineTryptaminesFluoxetineButyrophenonesBrainNarcoticsBehavior, Animal2,5-Dimethoxy-4-MethylamphetamineBiguanidesOctopamineEnkephalin, D-Penicillamine (2,5)-PainAntipsychotic AgentsEndorphinsLoxapineDynorphins5-MethoxytryptamineClozapineBiogenic MonoaminesHydroxyindoleacetic AcidBuprenorphineEnkephalin, LeucineReceptors, CatecholamineErgotamineAntidepressive AgentsMolecular Sequence DataNeuronsMianserinPiperidinesInjections, SpinalEnkephalin, Leucine-2-AlanineOndansetronBinding, CompetitivePyridinesDopamineCitaloprampara-Aminobenzoates