EnkephalinsEnkephalin, Ala(2)-MePhe(4)-Gly(5)-Enkephalin, LeucineEnkephalin, MethioninePolymorphism, GeneticEnkephalin, D-Penicillamine (2,5)-Enkephalin, Leucine-2-AlanineEndorphinsReceptors, OpioidReceptors, Opioid, muRNA, Transfer, GlyReceptors, Neurokinin-3Receptors, Opioid, deltaNaloxoneNeurokinin BEthylketocyclazocineTachykininsReceptors, TachykininCyclazocineD-Ala(2),MePhe(4),Met(0)-ol-enkephalinReceptors, Opioid, kappaGlycineSubstance PNarcotic AntagonistsNeurokinin AMorphineReceptors, Neurokinin-2Analgesics, OpioidDynorphinsAmino Acid SequenceMolecular Sequence DataCarboxypeptidase HNaltrexoneBenzeneacetamidesOpioid PeptidesBenzomorphansbeta-EndorphinGuinea PigsDiprenorphineOligopeptidesNarcoticsNeurokinin-1 Receptor AntagonistsAmino Acid SubstitutionMutagenesis, Site-DirectedEtorphineAlanineKineticsPeptide FragmentsProtein PrecursorsModels, MolecularReceptors, Neurokinin-1AnalgesicsThiorphanDose-Response Relationship, DrugMutationProtein ConformationStructure-Activity RelationshipNeprilysinBinding SitesMorphinansTioproninPeptidesBase SequenceAdrenal MedullaPiperidinesIrisPyrrolidinesBrainIleumSomatostatinChromaffin GranulesBinding, CompetitivePoint MutationDrug ToleranceAminolevulinic AcidGlobus PallidusCarboxypeptidasesMutation, MissenseDihydromorphineVas DeferensAmino AcidsRats, Inbred StrainsProtein Structure, SecondaryRats, Sprague-DawleyReceptors, Adrenergic, beta-1Recombinant ProteinsReceptors, Adrenergic, beta-2Protease InhibitorsInjections, IntraventricularEscherichia coliInjections, SpinalBenzamidesCattleNeuronsProtein BindingCorpus StriatumBenzylidene CompoundsHydrolysisChromatography, High Pressure LiquidNeurotransmitter Agents