Toxicity Tests, AcuteToxicity TestsToxicity Tests, SubchronicToxicity Tests, ChronicToxicity Tests, SubacuteLethal Dose 50MorindaAnimal Testing AlternativesSkin Irritancy TestsAnalgesicsWater Pollutants, ChemicalDaphniaAmphipodaToxicologyPlant ExtractsArtemiaDose-Response Relationship, DrugPain MeasurementMorphinePainAnalgesics, OpioidDeveloped CountriesDrug ToleranceInjections, SpinalNaloxoneNarcotic AntagonistsAcetic AcidEconomicsReceptors, Opioid, muPain ThresholdFormaldehydeHyperalgesiaAnalgesics, Non-NarcoticNociceptionReceptors, OpioidCarrageenanNaltrexoneDipyroneNociceptorsAnalgesiaReceptors, Opioid, deltaRats, Sprague-DawleyNociceptive PainSpinal CordEdemaConsensus Development Conferences as TopicPeriaqueductal GrayMice, Inbred ICRInjections, IntraventricularHot TemperatureOrganisms, Genetically ModifiedMorphinansOpioid PeptidesCaulerpaHealth ExpendituresBehavior, AnimalReference BooksDynorphinsNarcoticsReceptors, Opioid, kappaLocal Lymph Node AssayEnkephalin, Ala(2)-MePhe(4)-Gly(5)-Enkephalin, D-Penicillamine (2,5)-Guidelines as TopicRats, WistarDrug SynergismEnkephalinsDrug InteractionsReaction TimeCombretumTramadolClinical Laboratory TechniquesNalorphinePhytotherapySocial Control, FormalAcute PainBiological AssayRotarod Performance TestTestosterone PropionateInternational CooperationConsensusClonidineBenchmarkingCyclohexanecarboxylic AcidsDisease Models, AnimalUnited States Environmental Protection AgencyEuropean UnionFentanylAnti-Inflammatory AgentsEnkephalin, MethionineTailAdministration, OralLecythidaceaeInjections, IntraperitonealMorphine DependenceConsumer Product SafetyEndocrine DisruptorsInjections, SubcutaneousDiocleaMorphine Derivatives