Neurokinin ANeurokinin BDynorphinsReceptors, Neurokinin-2Receptors, Neurokinin-1TachykininsReceptors, Neurokinin-3Substance PReceptors, TachykininNeurokinin-1 Receptor AntagonistsReceptors, Opioid, kappaEndorphinsEnkephalinsKisspeptinsReceptors, OpioidEnkephalin, LeucineArcuate NucleusReceptors, NeurotransmitterNaltrexoneEledoisinIsoindolesCapsaicinPhysalaeminOpioid PeptidesQuinuclidinesNeuropeptidesGuinea PigsEnkephalin, MethionineProtein PrecursorsSpinal CordNarcotic AntagonistsPyrrolidonecarboxylic AcidPiperidinesBenzeneacetamidesPeptide FragmentsNeuronsReceptors, Opioid, muInjections, SpinalRats, Sprague-DawleyCalcitonin Gene-Related PeptideNaloxonePyrrolidinesbeta-EndorphinDose-Response Relationship, DrugHyperesthesiaMuscle, SmoothGonadotropin-Releasing HormoneBronchoconstrictionAnalgesics, OpioidPosterior Horn CellsTracheaReceptors, Opioid, deltaNeurotransmitter AgentsMuscle ContractionRadioligand AssayDiprenorphineThiorphanBenzamidesLevorphanolEnkephalin, Leucine-2-AlaninePain MeasurementEnkephalin, D-Penicillamine (2,5)-Electric StimulationOligopeptidesRats, WistarHypothalamusAtropineIleumNeurogenic InflammationRadioimmunoassayEnkephalin, Ala(2)-MePhe(4)-Gly(5)-PainBinding, CompetitiveNarcoticsHyperalgesiaRats, Inbred StrainsNeprilysinAnalgesicsNeurons, AfferentNociceptorsAmino Acid SequenceBrain ChemistryCricetinaeGalaninProto-Oncogene Proteins c-fosNerve FibersImmunohistochemistryCHO CellsBehavior, AnimalGanglia, SpinalInjections, IntraventricularCorpus StriatumBiphenyl CompoundsBenzomorphansPeptides, CyclicAnalgesics, Non-NarcoticBethanechol CompoundsPhysical StimulationKidney PelvisLuteinizing Hormone