Cell PolarityAmino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialMutationAmino Acid Transport SystemsSequence AlignmentBase SequenceMolecular Sequence DataAmino Acid MotifsEscherichia coliBinding SitesMutagenesis, Site-DirectedDNA, ComplementarySequence Homology, Nucleic AcidKineticsProtein Structure, TertiaryProtein BindingProtein ConformationAmino Acids, AromaticModels, MolecularRecombinant ProteinsPeptide FragmentsAmino Acids, Branched-ChainAmino Acids, SulfurLeucineMembrane ProteinsCell LineStructure-Activity RelationshipFrizzled ReceptorsRecombinant Fusion ProteinsDNABacterial ProteinsSubstrate SpecificityPeptidesDrosophila ProteinsMolecular WeightProteinsRestriction MappingCarrier ProteinsPhylogenyRNA, MessengerSequence Analysis, DNAGenes, BacterialConserved SequencePlasmidsAlanineElectrophoresis, Polyacrylamide GelProtein Structure, SecondaryBody PatterningDrosophilaDNA PrimersBiological TransportSpecies SpecificityAmino Acid Transport Systems, BasicSaccharomyces cerevisiaeSignal TransductionLysineChromatography, High Pressure LiquidCell MembraneIsoleucineAmino Acids, BasicModels, BiologicalCodonGenesCattleProtein BiosynthesisPhenotypeMutagenesisGlycineTrypsinTranscription, GeneticCyanogen BromideGlutamineOpen Reading FramesValineSequence DeletionMorphogenesisAmino Acids, DiaminoMethionineTransfectionDrosophila melanogasterPolymerase Chain ReactionGene ExpressionArginineAspartic AcidPoint MutationEmbryo, NonmammalianGene LibraryExcitatory Amino AcidsSequence AnalysisProlineFungal ProteinsCells, CulturedEpithelial CellsTryptophanNitrogen