Gene DosageDosage Compensation, GeneticMolecular Sequence DataBase SequenceChromosome MappingGenesCloning, MolecularAmino Acid SequencePhenotypeExonsRNA, MessengerMutationTranscription, GeneticGene Expression RegulationAllelesDosage FormsTranscription FactorsMice, Inbred C57BLSequence Homology, Nucleic AcidDNA, ComplementaryGene ExpressionPromoter Regions, GeneticIntronsMice, TransgenicSequence Homology, Amino AcidHomozygoteGene Expression Regulation, DevelopmentalDNA-Binding ProteinsDNAGene Expression ProfilingGene DuplicationHeterozygoteX Chromosome InactivationMice, Mutant StrainsGenomic ImprintingRestriction MappingMice, KnockoutIn Situ Hybridization, FluorescenceOligonucleotide Array Sequence AnalysisDown SyndromeGenotypePolymerase Chain ReactionCrosses, GeneticPlasmidsX ChromosomeTrisomyProteinsMultigene FamilyGenomeNucleic Acid HybridizationChromosomes, Human, Pair 21Sequence AlignmentGenes, RegulatorHaploinsufficiencyOrgan SpecificityBlotting, SouthernMice, Inbred StrainsNuclear ProteinsModels, GeneticSpecies SpecificityGene DeletionAneuploidyReverse Transcriptase Polymerase Chain ReactionAlternative SplicingBlotting, NorthernSequence Analysis, DNAGenes, FungalDrosophilaSaccharomyces cerevisiaeMuridaeEmbryo, MammalianConserved SequenceDNA PrimersIn Situ HybridizationEvolution, MolecularGene TargetingTissue DistributionEmbryonic and Fetal DevelopmentPolyploidyGene AmplificationGenes, X-LinkedDisease Models, AnimalGene LibrarySequence HomologyBrainDrosophila ProteinsNerve Tissue ProteinsGenetic Complementation TestCell LineDatabases, GeneticHomeodomain ProteinsDatabases, Nucleic AcidEye AbnormalitiesCharcot-Marie-Tooth DiseaseSex ChromosomesSuppression, GeneticRepressor ProteinsMembrane ProteinsEscherichia coliGenomic Library