Gene Expression Regulation, DevelopmentalIn Situ HybridizationEmbryo, NonmammalianZebrafishEmbryonic StructuresMolecular Sequence DataBody PatterningAmino Acid SequenceEmbryo, MammalianDNA, ComplementaryMesodermBase SequenceEmbryonic and Fetal DevelopmentNervous SystemGenes, HomeoboxSequence Homology, Amino AcidNeoplasms, Germ Cell and EmbryonalTranscription FactorsGene Expression ProfilingRNA, MessengerHomeodomain ProteinsXenopus ProteinsGene ExpressionCloning, MolecularFibroblast Growth Factor 9Zebrafish ProteinsDrosophilaDNA-Binding ProteinsDrosophila ProteinsEmbryonic DevelopmentTissue DistributionPhylogenyEctodermGenes, InsectDrosophila melanogasterSequence AlignmentChordata, NonvertebrateMultigene FamilyCentral Nervous SystemGene Expression RegulationReverse Transcriptase Polymerase Chain ReactionSomitesExtremitiesGastrulaMorphogenesisLac OperonOrgan SpecificityTestisWheat Germ AgglutininsXenopusPhenotypeCell DifferentiationTranscription, GeneticChick EmbryoImmunohistochemistryOligonucleotide Array Sequence AnalysisTrans-ActivatorsSpermatogenesisEmbryonic InductionInsect ProteinsMice, TransgenicConserved SequenceHigh Mobility Group ProteinsGene LibraryPromoter Regions, GeneticMutationDNA PrimersBlotting, NorthernRNASea UrchinsTooth GermGerm LayersXenopus laevisNuclear ProteinsEvolution, MolecularZinc FingersChromosome MappingTime FactorsPolymerase Chain ReactionGene Expression Regulation, PlantMice, Inbred StrainsSequence Analysis, DNASignal TransductionSequence Homology, Nucleic AcidNerve Tissue ProteinsMembrane ProteinsBrainTesticular NeoplasmsGenesGonadsSpermatozoaProto-Oncogene ProteinsNucleic Acid HybridizationHeartSertoli CellsCluster AnalysisSpermatogoniaSeminiferous TubulesSpermatocytesSpermatids