Genes, HomeoboxHomeodomain ProteinsGene Expression Regulation, DevelopmentalTranscription FactorsMolecular Sequence DataIn Situ HybridizationLIM-Homeodomain ProteinsOtx Transcription FactorsGoosecoid ProteinBase SequenceAmino Acid SequenceAvian ProteinsMSX1 Transcription FactorBody PatterningAntennapedia Homeodomain ProteinSequence Homology, Amino AcidMorphogenesisMesodermDrosophila ProteinsEmbryo, NonmammalianDrosophilaTrans-ActivatorsRepressor ProteinsCell DifferentiationGene ExpressionCloning, MolecularMultigene FamilyExtremitiesEye ProteinsChordata, NonvertebrateDNA-Binding ProteinsXenopus ProteinsEctodermEndodermDNA, ComplementaryEmbryonic and Fetal DevelopmentHeadZebrafish ProteinsVertebratesNerve Tissue ProteinsProsencephalonMeristemMutationRNA, MessengerGastrulaPhenotypeSequence AlignmentEmbryonic InductionNervous SystemChick EmbryoGenes, InsectEyeEmbryo, MammalianChromosome MappingTelencephalonDNA PrimersPromoter Regions, GeneticGene Expression RegulationPhylogenyRhombencephalonMice, Mutant StrainsPaired Box Transcription FactorsTranscription, GeneticCentral Nervous SystemBranchial RegionZebrafishCell LineageBlotting, NorthernNuclear ProteinsMice, TransgenicBone Morphogenetic Protein 4Caenorhabditis elegans ProteinsBone Morphogenetic ProteinsUrochordataEmbryonic StructuresAnimals, Genetically ModifiedStem CellsReverse Transcriptase Polymerase Chain ReactionMice, KnockoutEvolution, MolecularPlant ProteinsConserved SequenceRetinaPOU Domain FactorsAnophthalmosDNAXenopusFetal ProteinsSequence Homology, Nucleic AcidXenopus laevisDiencephalonLac OperonTailBiological EvolutionCaenorhabditis elegansGenes, ReporterMegacolonBasic Helix-Loop-Helix Transcription FactorsHydrozoaPlanarians