Cell Culture TechniquesCells, CulturedHematopoietic Stem CellsAntigens, CD34Colony-Forming Units AssayTissue Culture TechniquesCell DifferentiationMice, Inbred NODMice, SCIDFetal BloodHematopoietic Stem Cell TransplantationFlow CytometryTime FactorsMice, Inbred C57BLStem Cell FactorCell ProliferationBone Marrow CellsLong Interspersed Nucleotide ElementsBiological AssayFluorescent Antibody Technique, DirectCell DivisionTransduction, GeneticBacterial ToxinsGraft SurvivalOrgan Culture TechniquesEnterotoxinsCell LineTransplantation, HeterologousPolymerase Chain ReactionStromal CellsAntigens, CDCytotoxinsSignal TransductionBacteriological TechniquesVirus CultivationGenetic VectorsCulture TechniquesClostridium difficileMolecular Sequence DataEvaluation Studies as TopicCell SurvivalMice, KnockoutAntiviral AgentsSensitivity and SpecificityFecesStem CellsCulture MediaDrosophila ProteinsCricetinaeBase SequenceVirulenceEndothelial CellsMutationDNA, BacterialCell MovementHeLa CellsReverse Transcriptase Polymerase Chain ReactionPhenotypeBacterial ProteinsRecombinant ProteinsAmino Acid SequenceAntibodies, MonoclonalCell Line, TumorMice, Inbred BALB C