Enteric Nervous SystemGastrointestinal TractDigestive SystemHirschsprung DiseaseMyenteric PlexusSubmucous PlexusNeural CrestCentral Nervous SystemGastrointestinal MotilityNervous SystemDigestive System Physiological PhenomenaProto-Oncogene Proteins c-retPeripheral Nervous SystemIntestinesSOXE Transcription FactorsNeuronsColonEndothelin-3Gastrointestinal DiseasesIleumIntestine, SmallUpper Gastrointestinal TractNeurogliaStomachGlial Cell Line-Derived Neurotrophic FactorGastrointestinal NeoplasmsGangliaIntestinal MucosaImmunohistochemistryIntestine, LargeJejunumQuailGlial Cell Line-Derived Neurotrophic Factor ReceptorsVasoactive Intestinal PeptideInterstitial Cells of CajalVagus NervePeristalsisMegacolonSerotonin 5-HT4 Receptor AgonistsIntestinal Pseudo-ObstructionCentral Nervous System DiseasesLower Gastrointestinal TractGuinea PigsCell MovementGastrointestinal TransitIleusDuodenumGene Expression Regulation, DevelopmentalNeurofilament ProteinsChick EmbryoReceptor Protein-Tyrosine KinasesIn Situ HybridizationNitrergic NeuronsBrainHigh Mobility Group ProteinsStem CellsMice, Inbred C57BLCeliac PlexusMuscle, SmoothMice, TransgenicUrinary Tract InfectionsNerve Tissue ProteinsGastric EmptyingCentral Nervous System NeoplasmsIrritable Bowel SyndromeReceptors, Serotonin, 5-HT4Neurotransmitter AgentsCoturnixAutonomic Nervous SystemUbiquitin ThiolesteraseCell DifferentiationSignal TransductionNeurogenesisRats, Sprague-DawleyNerve Growth FactorsSerotoninHexamethoniumDisease Models, AnimalMice, Mutant StrainsCholine O-AcetyltransferaseReceptor, Endothelin BManducaRNA, MessengerMice, KnockoutMyoelectric Complex, MigratingTime FactorsMolecular Sequence DataUrinary TractCecumNADPH DehydrogenaseCalbindin 2Cell CountGastroparesisTetrodotoxinNeuropeptidesGanglia, AutonomicMutationPyloric AntrumCells, CulturedSympathetic Nervous System