Umbilical CordFetal BloodUmbilical VeinsUmbilical ArteriesCord Blood Stem Cell TransplantationStem CellsSpinal CordSpinal Cord InjuriesHernia, UmbilicalHematopoietic Stem CellsPregnancyUrachal CystInfant, NewbornBlood BanksMesenchymal Stromal CellsStem Cell TransplantationCells, CulturedWharton JellyHuman Umbilical Vein Endothelial CellsHematopoietic Stem Cell TransplantationUltrasonography, PrenatalUmbilicusPlant StemsAntigens, CD34Gestational AgeAdult Stem CellsFetusNeoplastic Stem CellsCell DifferentiationMesenchymal Stem Cell TransplantationMaternal-Fetal ExchangePlacentaPluripotent Stem CellsEndothelium, VascularFetal HypoxiaEndothelial CellsCell SeparationCell LineageMultipotent Stem CellsInduced Pluripotent Stem CellsNeural Stem CellsStem Cell FactorFetal Stem CellsCell ProliferationFlow CytometryStem Cell NicheUrachusSpinal Cord DiseasesFetal DiseasesAntigens, CDTime FactorsAmniotic FluidColony-Forming Units AssaySpinal Cord CompressionNuchal CordCoculture TechniquesBone Marrow CellsCell Culture TechniquesUltrasonography, DopplerMice, SCIDHeart Rate, FetalFetal Growth RetardationPlacental CirculationBrain StemGraft vs Host DiseaseAsphyxiaApgar ScorePregnancy Trimester, FirstSpermatic CordTransplantation ConditioningMeconiumCesarean SectionPregnancy OutcomeConstrictionFetal DistressTransplantation, HomologousImmunophenotypingHematopoiesisSpinal Cord NeoplasmsBlood PreservationDelivery, ObstetricTissue EngineeringHistocompatibility TestingProlapseOligohydramniosMice, Inbred NODImmunohistochemistryNeovascularization, PhysiologicRNA, MessengerHematologic NeoplasmsCell- and Tissue-Based TherapyCell SurvivalReverse Transcriptase Polymerase Chain ReactionAntigens, CD38OsteogenesisAmnionCell MovementBiological MarkersCell AdhesionSpinal Cord Ischemia