Body PatterningGastrulaEmbryo, NonmammalianXenopus ProteinsOrganizers, EmbryonicZebrafish ProteinsEmbryonic InductionZebrafishGene Expression Regulation, DevelopmentalXenopus laevisEctodermXenopusMesodermbeta CateninMorphogenesisHomeodomain ProteinsBone Morphogenetic ProteinsCytoskeletal ProteinsIn Situ HybridizationMicroscopy, Electron, ScanningWnt ProteinsTrans-ActivatorsMolecular Sequence DataSignal TransductionModels, MolecularAmino Acid SequenceProtein ConformationBinding SitesCrystallography, X-RayStructure-Activity RelationshipKineticsProtein Structure, SecondaryTime FactorsTreatment OutcomeMagnetic Resonance SpectroscopyProtein BindingSide-Population CellsHydrogen BondingDrug-Related Side Effects and Adverse ReactionsMolecular StructureProtein Structure, TertiaryMutagenesis, Site-DirectedFunctional LateralityDose-Response Relationship, DrugMutationSubstrate SpecificityBase SequenceEscherichia coliRecombinant ProteinsModels, ChemicalPeptidesHydrogen-Ion ConcentrationAmino AcidsMolecular Conformation