Gene Expression Regulation, DevelopmentalEmbryo, NonmammalianEmbryonic DevelopmentZebrafishXenopus ProteinsXenopus laevisZygoteEmbryonic and Fetal DevelopmentGastrulaBlastocystMolecular Sequence DataIn Situ HybridizationZebrafish ProteinsEmbryo, MammalianFertilizationOocytesXenopusBody PatterningOvumBlastulaRNA, MessengerAmino Acid SequenceSea UrchinsMorphogenesisLarvaBase SequenceCell DifferentiationMesodermEctodermCleavage Stage, OvumPregnancyAnimals, NewbornDictyosteliumHomeodomain ProteinsTranscription FactorsOogenesisEmbryonic InductionSequence Homology, Amino AcidGastrulationChick EmbryoMorulaOvoviviparityNervous SystemTime FactorsBlastomeresAnimals, Genetically ModifiedNotochordPhenotypeCloning, MolecularStrongylocentrotus purpuratusSignal TransductionGenes, DevelopmentalMutationNeural CrestYolk SacParthenogenesisChild DevelopmentBlastodermImmunohistochemistryGene ExpressionGerm LayersSomitesReverse Transcriptase Polymerase Chain ReactionTranscription, GeneticDNA-Binding ProteinsNeuronsRNA, Messenger, StoredDNA, ComplementaryMicroinjectionsBrainEndodermModels, BiologicalOrganogenesisEmbryo Culture TechniquesMorpholinosVivisectionStarfishBlotting, NorthernCell LineageEmbryonic Stem CellsStem CellsParacentrotusRhombencephalonGerm CellsSequence AlignmentDrosophila ProteinsArtemiaPolynucleotide AdenylyltransferaseFetal ProteinsDNA PrimersGenes, HomeoboxGene Expression ProfilingDevelopmental BiologyCytoplasmMice, Inbred C57BLNerve Tissue ProteinsCells, CulturedBone Morphogenetic ProteinsPteridaceaePorphyra