AbsorptionIntestinal AbsorptionAmino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialAmino Acid Transport SystemsKineticsSequence AlignmentBase SequenceBinding SitesEscherichia coliMolecular Sequence DataMutationAmino Acid MotifsProtein ConformationMutagenesis, Site-DirectedModels, MolecularHydrogen-Ion ConcentrationNeutral RedRecombinant ProteinsDNA, ComplementaryPeptide FragmentsLeucineBiological AvailabilityStructure-Activity RelationshipMolecular WeightSequence Homology, Nucleic AcidAmino Acids, AromaticSkin AbsorptionBiological TransportProtein BindingSubstrate SpecificityAmino Acids, Branched-ChainChromatography, High Pressure LiquidAmino Acids, SulfurPeptidesDNAProtein Structure, TertiaryBacterial ProteinsJejunumAmino Acids, NeutralCell LineElectrophoresis, Polyacrylamide GelAlanineNeutral CeramidaseCattleSpectrophotometrySpectrophotometry, AtomicPhylogenySpecies SpecificityProteinsRestriction MappingRNA, MessengerX-Ray Absorption SpectroscopySequence Analysis, DNACarrier ProteinsProtein Structure, SecondaryRecombinant Fusion ProteinsAmino Acid Transport Systems, BasicGenes, BacterialLysineIronIntestine, SmallSpectrum AnalysisPlasmidsZincNitrogenRabbitsGlycineConserved SequenceIsoleucineDNA PrimersTrypsinSpectrophotometry, UltravioletTryptophanTemperatureCircular DichroismSwineAmino Acids, BasicCodonGlutamineTime FactorsLiverHydrolysisMethionineIleumDietary ProteinsMembrane ProteinsAmino Acids, DiaminoArginineIntestinesValinePhenylalanineCysteineWaterEvolution, MolecularChromatography, Gel