NeuropeptidesPainChronic PainPain ManagementSubstance PPain ThresholdFMRFamidePain, PostoperativeLow Back PainBack PainPain MeasurementCalcitonin Gene-Related PeptideNeuropeptide YAbdominal PainVasoactive Intestinal PeptideNeck PainPain, IntractablePelvic PainPain PerceptionFacial PainReceptors, NeuropeptideInvertebrate HormonesAcute PainPain, ReferredGalaninTachykininsShoulder PainBrachyuraHypothalamusNeurosecretory SystemsMusculoskeletal PainNeurokinin ACapsaicinPituitary Adenylate Cyclase-Activating PolypeptideEnkephalin, MethionineDynorphinsPyrrolidonecarboxylic AcidAnalgesicsNeurotransmitter AgentsAgouti-Related ProteinSomatostatinNeurokinin BGastrin-Releasing PeptideProtein PrecursorsNeurogenic InflammationMoltingPeptide PHINeurotensinNociceptive PainNeuralgiaAplysiaEnkephalinsPro-OpiomelanocortinNeuroimmunomodulationSecretogranin IIAnalgesics, OpioidNeuronsReceptors, Neurokinin-1Hypothalamic HormonesOrexin ReceptorsVasotocinEndorphinsBombesinChronic DiseaseReceptors, TachykininArthropod ProteinsOxytocinNeurons, AfferentAmino Acid SequenceCorticotropin-Releasing HormoneInsect HormonesCholecystokininNociceptorsMolecular Sequence DataMyofascial Pain SyndromesHyperalgesiaReceptors, Neuropeptide YGangliaComplex Regional Pain SyndromesRats, Sprague-DawleyVisceral PainEnkephalin, LeucinePituitary HormonesProprotein Convertase 2beta-EndorphinLymnaeaArcuate NucleusOpioid PeptidesVasopressinsNeprilysinOligopeptidesArthralgiaImmunohistochemistryCarboxypeptidase HSecretory VesiclesSpectrometry, Mass, Matrix-Assisted Laser Desorption-IonizationNeuroendocrine CellsAmidine-LyasesReceptors, Vasoactive Intestinal Polypeptide, Type IReceptors, Vasoactive Intestinal Peptide