EnkephalinsEnkephalin, Ala(2)-MePhe(4)-Gly(5)-Enkephalin, LeucineEnkephalin, MethioninePolymorphism, GeneticEnkephalin, D-Penicillamine (2,5)-Enkephalin, Leucine-2-AlanineEndorphinsReceptors, OpioidReceptors, Opioid, muPharmacologyRNA, Transfer, GlyPharmacology, ClinicalReceptors, Neurokinin-3Receptors, Opioid, deltaNaloxoneNeurokinin BEthylketocyclazocineTachykininsReceptors, TachykininCyclazocineD-Ala(2),MePhe(4),Met(0)-ol-enkephalinReceptors, Opioid, kappaGlycineNarcotic AntagonistsSubstance PMorphineNeurokinin AReceptors, Neurokinin-2Analgesics, OpioidDynorphinsAmino Acid SequenceMolecular Sequence DataOpioid PeptidesNaltrexoneCarboxypeptidase HGuinea PigsBenzeneacetamidesBenzomorphansbeta-EndorphinDose-Response Relationship, DrugNarcoticsDiprenorphineOligopeptidesNeurokinin-1 Receptor AntagonistsAmino Acid SubstitutionKineticsMutagenesis, Site-DirectedAnalgesicsAlanineStructure-Activity RelationshipModels, MolecularEtorphinePeptide FragmentsProtein PrecursorsMutationProtein ConformationReceptors, Neurokinin-1PiperidinesThiorphanBinding SitesBinding, CompetitivePeptidesRadioligand AssayBrainNeprilysinBase SequencePyrrolidinesMorphinansTioproninRats, Sprague-DawleyAdrenal MedullaIleumIrisDrug ToleranceLigandsSomatostatinPoint MutationNeuronsChromaffin GranulesRecombinant ProteinsVas DeferensProtein BindingAminolevulinic AcidInjections, SpinalGlobus PallidusRats, Inbred StrainsCarboxypeptidasesAmino AcidsReceptors, Adrenergic, beta-2Receptors, Adrenergic, beta-1Mutation, MissenseCell LineProtein Structure, SecondaryDihydromorphineNeurotransmitter AgentsChromatography, High Pressure LiquidBenzamidesCorpus StriatumCattle