AbsorptionIntestinal AbsorptionAmino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialAmino Acid Transport SystemsSequence AlignmentKineticsBase SequenceEscherichia coliAmino Acid MotifsBinding SitesMutationMolecular Sequence DataMutagenesis, Site-DirectedProtein ConformationDNA, ComplementaryBiological AvailabilitySkin AbsorptionModels, MolecularAmino Acids, AromaticRecombinant ProteinsPeptide FragmentsSequence Homology, Nucleic AcidLeucineAmino Acids, Branched-ChainAmino Acids, SulfurStructure-Activity RelationshipMolecular WeightProtein BindingBiological TransportSubstrate SpecificityProtein Structure, TertiaryBacterial ProteinsPeptidesJejunumDNAChromatography, High Pressure LiquidSpectrophotometrySpectrophotometry, AtomicCell LineX-Ray Absorption SpectroscopyRestriction MappingAlanineElectrophoresis, Polyacrylamide GelProteinsPhylogenyRNA, MessengerCattleSpecies SpecificityRecombinant Fusion ProteinsGenes, BacterialSequence Analysis, DNAIronProtein Structure, SecondaryCarrier ProteinsIntestine, SmallLysineSpectrum AnalysisPlasmidsZincAmino Acid Transport Systems, BasicNitrogenHydrogen-Ion ConcentrationConserved SequenceIsoleucineGlycineDNA PrimersAmino Acids, BasicLiverRabbitsTrypsinCodonGlutamineMethionineDietary ProteinsValineCyanogen BromideIleumTryptophanSwineIntestinesSpectrophotometry, UltravioletArginineMembrane ProteinsOpen Reading FramesGenesCysteineAmino Acids, DiaminoProtein BiosynthesisAdministration, OralProlineAspartic AcidCircular DichroismSaccharomyces cerevisiaePolymerase Chain ReactionPhenylalanine