EnkephalinsEnkephalin, Ala(2)-MePhe(4)-Gly(5)-Enkephalin, LeucineEnkephalin, MethionineEnkephalin, D-Penicillamine (2,5)-Enkephalin, Leucine-2-AlanineEndorphinsReceptors, OpioidReceptors, Opioid, muReceptors, Neurokinin-3Receptors, Opioid, deltaNeurokinin BNaloxoneEthylketocyclazocineTachykininsReceptors, TachykininCyclazocineD-Ala(2),MePhe(4),Met(0)-ol-enkephalinReceptors, Opioid, kappaSubstance PNeurokinin ANarcotic AntagonistsMorphineReceptors, Neurokinin-2DynorphinsAnalgesics, OpioidRNA, Transfer, GlyCarboxypeptidase HBenzomorphansBenzeneacetamidesNaltrexonebeta-EndorphinGuinea PigsOpioid PeptidesDiprenorphineNeurokinin-1 Receptor AntagonistsNarcoticsGlycineOligopeptidesEtorphineThiorphanReceptors, Neurokinin-1Amino Acid SequenceProtein PrecursorsAnalgesicsMolecular Sequence DataDose-Response Relationship, DrugMorphinansTioproninNeprilysinPeptide FragmentsAdrenal MedullaPiperidinesIrisAlanineKineticsPyrrolidinesChromaffin GranulesBrainIleumAminolevulinic AcidSomatostatinGlobus PallidusMutagenesis, Site-DirectedDrug ToleranceDihydromorphineAmino Acid SubstitutionStructure-Activity RelationshipVas DeferensPeptidesRats, Inbred StrainsCarboxypeptidasesBinding, CompetitiveModels, MolecularRats, Sprague-DawleyBenzamidesProtein ConformationInjections, IntraventricularInjections, SpinalCorpus StriatumBenzylidene CompoundsMyenteric PlexusLocus CoeruleusNeuronsBinding SitesProtease InhibitorsNeurotransmitter AgentsMorphine DerivativesNeuroblastomaCattleMutationRadioligand AssaySpinal CordGalanin