EnkephalinsEnkephalin, MethionineEnkephalin, LeucineEnkephalin, Ala(2)-MePhe(4)-Gly(5)-Enkephalin, Leucine-2-AlanineEnkephalin, D-Penicillamine (2,5)-PeptidesEndorphinsReceptors, OpioidReceptors, Opioid, deltaReceptors, Opioid, muNaloxonePeptide FragmentsPeptide LibraryOligopeptidesDynorphinsPeptides, CyclicAntimicrobial Cationic PeptidesEthylketocyclazocineCyclazocineOpioid PeptidesNarcotic AntagonistsCarboxypeptidase HMorphinebeta-EndorphinBenzomorphansProtein PrecursorsAmino Acid SequenceNaltrexoneD-Ala(2),MePhe(4),Met(0)-ol-enkephalinPeptide MappingAnalgesics, OpioidReceptors, Opioid, kappaNarcoticsDiprenorphineVasoactive Intestinal PeptideNatriuretic Peptide, BrainMolecular Sequence DataEtorphineKineticsNeprilysinThiorphanProtein BindingAnalgesicsProtein ConformationChromatography, High Pressure LiquidCalcitonin Gene-Related PeptideStructure-Activity RelationshipCell-Penetrating PeptidesBinding, CompetitiveAdrenal MedullaModels, MolecularMorphinansTioproninPeptide BiosynthesisBinding SitesBrainSomatostatinPeptide YYCattlePeptide Nucleic AcidsDose-Response Relationship, DrugNatriuretic Peptide, C-TypeSubstance PPyrrolidinesRats, Sprague-DawleyGuinea PigsNatriuretic PeptidesChromaffin GranulesCell LineCarboxypeptidasesBase SequenceIleumRats, Inbred StrainsGastrin-Releasing PeptideProtein Structure, SecondaryMass SpectrometryReceptors, Formyl PeptidePeptide PHIPeptide SynthasesPeptide HydrolasesReceptors, PeptideSubstrate SpecificityGlobus PallidusAtrial Natriuretic FactorProtease InhibitorsEpitopesAmino AcidsVas DeferensDrug ToleranceNeuronsMolecular WeightInjections, IntraventricularCells, CulturedDihydromorphineGlycopeptidesEndopeptidasesRNA, MessengerGalaninMagnetic Resonance Spectroscopy