Gene Expression Regulation, DevelopmentalCell DifferentiationTranscription FactorsCell LineageHomeodomain ProteinsPhenotypeHornsSoftware DesignPersonality DevelopmentSignal TransductionReceptors, NotchMutationDrosophila ProteinsBiological EvolutionMolecular Sequence DataThymus GlandAdolescent DevelopmentNational Institutes of Health (U.S.)ZebrafishArabidopsisGene Expression Regulation, PlantEmbryo, NonmammalianWnt ProteinsIn Situ HybridizationHedgehog ProteinsMorphogenesisDNA-Binding ProteinsBody PatterningArabidopsis ProteinsModels, BiologicalLymphopoiesisDrosophila melanogasterDrosophilaLarvaGenes, InsectRepressor ProteinsInsect ProteinsAmino Acid SequenceEyeFlowersGene Expression ProfilingChild DevelopmentWingMice, Inbred C57BLPollenBasic Helix-Loop-Helix Transcription FactorsPhylogenySpores, FungalBase SequenceGene Expression RegulationPlant Growth RegulatorsModels, PsychologicalCaenorhabditis elegansEmbryonic Stem CellsStem CellsEmbryonic DevelopmentPlant RootsGenes, PlantMicroscopy, Electron, ScanningTrans-ActivatorsNuclear ProteinsReverse Transcriptase Polymerase Chain ReactionReceptors, Antigen, T-Cell, alpha-betaCaenorhabditis elegans ProteinsCells, CulturedOligonucleotide Array Sequence AnalysisProgram DevelopmentReproductionMice, TransgenicGene ExpressionMesodermLongitudinal StudiesModels, GeneticRNA, MessengerImmunohistochemistryHematopoietic Stem CellsSequence Homology, Amino AcidCell DivisionB-LymphocytesTime FactorsAnimals, Genetically ModifiedTranscription, GeneticPromoter Regions, GeneticGene Regulatory NetworksMembrane ProteinsSpecies SpecificitySequence AlignmentEvolution, MolecularCloning, MolecularPlant LeavesEmbryo, MammalianTransforming Growth Factor betaPlant ProteinsBone Marrow CellsProtein BindingMice, Mutant StrainsFlow CytometryMice, KnockoutT-Lymphocyte SubsetsImmunophenotyping