Umbilical CordInfant, NewbornFetal BloodHyperbilirubinemia, NeonatalInfant, Newborn, DiseasesInfant, PrematurePregnancyUmbilical VeinsUmbilical ArteriesCord Blood Stem Cell TransplantationSpinal CordLeukocytes, MononuclearSpinal Cord InjuriesHernia, UmbilicalCells, CulturedUrachal CystAntigens, CD34Flow CytometryLymphocytesBlood BanksHematopoietic Stem CellsGestational AgePeripheral NervesT-LymphocytesWharton JellyUltrasonography, PrenatalBlood CellsHuman Umbilical Vein Endothelial CellsUmbilicusMonocytesAntigens, CDCell SeparationMaternal-Fetal ExchangeLymphocyte ActivationHematopoietic Stem Cell TransplantationTime FactorsFetusMesenchymal Stromal CellsImmunophenotypingCell DifferentiationPlacentaPeripheral Blood Stem Cell TransplantationEndothelium, VascularRNA, MessengerLeukocyte CountLeukocytesCytokinesEndothelial CellsFetal HypoxiaBlood Cell CountPeripheral Nervous SystemPeripheral Nervous System DiseasesB-LymphocytesStem CellsPolymerase Chain ReactionInterferon-gammaCell Culture TechniquesBone Marrow CellsCD4-Positive T-LymphocytesHematopoietic Stem Cell MobilizationColony-Forming Units AssayPhytohemagglutininsFetal DiseasesCoculture TechniquesReverse Transcriptase Polymerase Chain ReactionAnimals, NewbornBiological MarkersBone MarrowPeripheral Vascular DiseasesTransplantation, HomologousKiller Cells, NaturalAntibodies, MonoclonalGraft vs Host DiseaseCell ProliferationMice, SCIDSpinal Cord DiseasesMeconiumFetal Growth RetardationApgar ScoreUrachusInterleukin-2T-Lymphocyte SubsetsMolecular Sequence DataTransplantation, AutologousLymphocyte CountGranulocyte Colony-Stimulating FactorProspective StudiesAmniotic FluidUltrasonography, DopplerTransplantation ConditioningHematopoiesisTreatment OutcomeNeutrophilsAntigens, CD45Cell DivisionBlood PreservationTumor Necrosis Factor-alphaCase-Control StudiesInfant, Premature, DiseasesEnzyme-Linked Immunosorbent Assay