Receptors, Opioid, muReceptors, OpioidAnalgesics, OpioidSNARE ProteinsBone Morphogenetic Protein Receptors, Type IIReceptors, Opioid, deltaReceptors, Opioid, kappaBone Morphogenetic Protein Receptors, Type IQa-SNARE ProteinsOpioid PeptidesR-SNARE ProteinsBone Morphogenetic Protein ReceptorsVesicular Transport ProteinsVesicle-Associated Membrane Protein 2Synaptosomal-Associated Protein 25Syntaxin 1Qb-SNARE ProteinsMunc18 ProteinsNarcotic AntagonistsQc-SNARE ProteinsExocytosisNaloxoneMembrane FusionBacteriophage muOpioid-Related DisordersNaltrexoneSoluble N-Ethylmaleimide-Sensitive Factor Attachment ProteinsEnkephalinsEnkephalin, Ala(2)-MePhe(4)-Gly(5)-Membrane ProteinsMorphineSyntaxin 16NarcoticsBotulinum ToxinsSynaptotagmin IReceptor, Parathyroid Hormone, Type 1Synaptotagmin IIEnkephalin, D-Penicillamine (2,5)-SynaptotagminsN-Ethylmaleimide-Sensitive ProteinsEndorphinsReceptors, Parathyroid HormoneDynorphinsProtein BindingTetanus ToxinBuprenorphineEnkephalin, LeucineVesicle-Associated Membrane Protein 3Hypertension, PulmonaryEnkephalin, Leucine-2-AlanineSynaptic VesiclesMolecular Sequence DataNerve Tissue ProteinsDiprenorphineSecretory VesiclesAmino Acid SequenceSmad1 ProteinProtein TransportCell MembranePainUDPglucose-Hexose-1-Phosphate UridylyltransferaseReceptors, Growth Factorbeta-EndorphinQ-SNARE ProteinsGolgi ApparatusBenzeneacetamidesReceptors, Cell SurfaceProtein Structure, TertiaryAnalgesicsSignal TransductionMorphinansSmad Proteins, Receptor-RegulatedFentanylCarrier ProteinsDrug ToleranceBotulinum Toxins, Type APC12 CellsTransport VesiclesRats, Sprague-DawleyCytoplasmic VesiclesMethadonePain MeasurementMutationLigandsCell LineHydromorphoneBone Morphogenetic ProteinsRecombinant Fusion ProteinsBenzomorphansDose-Response Relationship, DrugG-Protein-Coupled Receptor Kinase 3Adaptor Proteins, Vesicular TransportPyrrolidinesBone Morphogenetic Protein 2GangliosidesEndosomesCells, CulturedAnalgesiarab GTP-Binding ProteinsBinding Sites