Fetal BloodCord Blood Stem Cell TransplantationLeukocytes, MononuclearUmbilical CordMaterials Management, HospitalInfant, NewbornCells, CulturedBlood PreservationBlood Buffy CoatPregnancyHerpesvirus 6, HumanHematopoietic Stem CellsBlood BanksErythrocyte TransfusionSpinal CordBlood TransfusionUmbilical VeinsAntigens, CD34Interferon-gammaUmbilical ArteriesLymphocyte ActivationCytokinesSpinal Cord InjuriesMast CellsMaternal-Fetal ExchangeFlow CytometryHematopoietic Stem Cell TransplantationCell SeparationAntigens, CDCell DifferentiationCell Culture TechniquesImmunophenotypingColony-Forming Units AssayMonocytesGraft vs Host DiseaseMice, SCIDT-LymphocytesHistocompatibility TestingMesenchymal Stromal CellsStem CellsHernia, UmbilicalTransplantation ConditioningAntigens, CD38Blood CellsMice, Inbred NODPlacentaBone Marrow CellsGestational AgeLymphocytesTime FactorsHematologic NeoplasmsNuchal CordCoculture TechniquesADP-ribosyl CyclaseBlood Cell CountTransplantation, HomologousPhytohemagglutininsUrachal CystFetusCell LineageDonor SelectionGraft SurvivalUnrelated DonorsRNA, MessengerHematopoiesisCryopreservationCell ProliferationAntigens, CD45Transplantation ChimeraBlood DonorsHLA AntigensCell DivisionKiller Cells, NaturalFetal Stem CellsNAD+ NucleosidaseEndothelial CellsMaternal ExposureLeukemiaWharton JellyPolymerase Chain ReactionStem Cell FactorInterleukin-2Amniotic FluidCD4-Positive T-LymphocytesTransplantation, HeterologousReverse Transcriptase Polymerase Chain ReactionHuman Umbilical Vein Endothelial CellsEnzyme-Linked Immunosorbent AssayTumor Necrosis Factor-alphaTissue DonorsMyeloablative AgonistsBiological MarkersInfant, PostmatureB-LymphocytesSpinal Cord DiseasesHIV-1Ultrasonography, PrenatalStem Cell TransplantationHematologic DiseasesEndothelium, Vascular