Umbilical CordFetal BloodCord Blood Stem Cell TransplantationUmbilical VeinsUmbilical ArteriesBlood BanksSpinal CordPregnancyInfant, NewbornAntigens, CD34Hematopoietic Stem CellsSpinal Cord InjuriesCells, CulturedTissue DonorsHernia, UmbilicalLeukocytes, MononuclearHematopoietic Stem Cell TransplantationUrachal CystBlood DonorsCell DifferentiationFlow CytometryMaternal-Fetal ExchangeCell SeparationMesenchymal Stromal CellsGraft vs Host DiseaseTransplantation, HomologousAntigens, CDImmunophenotypingStem CellsHistocompatibility TestingCell Culture TechniquesGestational AgeTransplantation ConditioningGraft SurvivalWharton JellyBlood PreservationFetusPlacentaColony-Forming Units AssayBlood CellsHuman Umbilical Vein Endothelial CellsTransplantation ChimeraBone Marrow CellsMice, SCIDUltrasonography, PrenatalTime FactorsUmbilicusT-LymphocytesCloning, OrganismLymphocytesHematologic NeoplasmsBlood Cell CountNuchal CordAntigens, CD38Endothelial CellsMice, Inbred NODCoculture TechniquesCell LineageEndothelium, VascularHematopoiesisADP-ribosyl CyclaseStem Cell TransplantationLymphocyte ActivationDonor SelectionUnrelated DonorsFetal Stem CellsCell ProliferationFetal HypoxiaAmniotic FluidNuclear Transfer TechniquesLiving DonorsLeukemiaMonocytesHLA AntigensCytokinesAntigens, CD45Transplantation, HeterologousBone Marrow TransplantationRNA, MessengerCryopreservationNAD+ NucleosidaseCell DivisionFetal DiseasesLeukocyte CountLeukocytesMyeloablative AgonistsBiological MarkersCell TransplantationPolymerase Chain ReactionReverse Transcriptase Polymerase Chain ReactionTreatment OutcomeKiller Cells, NaturalPeripheral NervesCesarean SectionInfant, PostmatureStem Cell FactorChimerismHematologic DiseasesMaternal ExposureCell Survival