Substance Abuse, IntravenousInjectionsNeedle SharingNeedle-Exchange ProgramsRisk-TakingInjections, IntravenousPrisonersSelf AdministrationHIV InfectionsAnalgesics, OpioidHepatitis CCocaineSexual BehaviorDose-Response Relationship, DrugTime FactorsPrevalenceRats, WistarRats, Sprague-DawleyInjections, IntramuscularInjections, IntralesionalInjections, SubcutaneousInjections, Intra-ArticularInjections, IntraperitonealGerminal CenterInjections, IntradermalInjections, EpiduralInjections, IntraventricularChild Day Care CentersInjections, Intra-ArterialIntravitreal InjectionsInjections, SpinalInjections, JetInjections, IntraocularCommunity Health CentersTrauma CentersTertiary Care CentersMicroinjectionsFlow Injection AnalysisTreatment OutcomeDisease Models, AnimalCenters for Disease Control and Prevention (U.S.)Retrospective StudiesSperm Injections, IntracytoplasmicMice, Inbred C57BLSyringesPoison Control CentersPhotosynthetic Reaction Center Complex ProteinsNeedlesInformation CentersAnesthetics, LocalVitreous BodyRabbitsTriamcinolone AcetonideProspective StudiesPregnancyMice, Inbred BALB CTissue DistributionTriamcinoloneLiverNeuromuscular AgentsBotulinum Toxins, Type ARats, Inbred StrainsLidocaineUnited StatesPain MeasurementPainBrainMicrotubule-Organizing CenterSpleenGenetic TherapyImmunohistochemistryBirthing CentersGenetic VectorsContrast MediaAnalysis of VarianceKineticsRandom AllocationRisk FactorsBehavior, AnimalNeuronsDrug Administration RoutesMolecular Sequence DataNeoplasm TransplantationGene Transfer TechniquesRNA, MessengerRecombinant ProteinsReproducibility of ResultsDogsMice, Inbred StrainsRadiopharmaceuticalsAntibodies, MonoclonalOocytesAnti-Dyskinesia AgentsDrug UsersCatsMice, NudeDouble-Blind MethodIodine RadioisotopesSensitivity and SpecificityMice, Inbred ICR