Mice, SCIDTransplantation, HeterologousMice, Inbred NODSevere Combined ImmunodeficiencyNeoplasm TransplantationMice, Inbred BALB CImmunologic Deficiency SyndromesDisease Models, AnimalSpleenLymphocyte TransfusionT-LymphocytesCell TransplantationXenograft Model Antitumor AssaysSpecific Pathogen-Free OrganismsB-LymphocytesHematopoietic Stem CellsAntigens, CD34ImmunocompetenceFetal BloodAdoptive TransferImmunotoxinsGraft SurvivalCell Line, TumorAntibodies, MonoclonalTumor Cells, CulturedFlow CytometryAntigens, CD45DNA-Activated Protein KinaseSubrenal Capsule AssayAntigens, CDCD4-Positive T-LymphocytesFetal Tissue TransplantationAntigens, CD19Thymus GlandHematopoietic Stem Cell TransplantationImmunophenotypingMice, Inbred C57BLSkin TransplantationChimeraKiller Cells, NaturalImmunotherapy, AdoptiveBone MarrowInjections, IntraperitonealCryptosporidiosisMice, Mutant StrainsCell DivisionCord Blood Stem Cell TransplantationLeukocyte TransfusionCells, CulturedTissue TransplantationBone Marrow CellsInterferon-gammaCell DifferentiationCytokinesCryptosporidium parvumImmunoglobulinsImmunization, PassiveGene Rearrangement, B-LymphocyteRibosome Inactivating Proteins, Type 1Antigens, CD7Pneumonia, PneumocystisPneumocystisNeoplastic Stem CellsCell ProliferationApoptosisGenetic Therapy