Amino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acids, EssentialAmino Acid SubstitutionCloning, MolecularMutationBase SequenceMolecular Sequence DataEscherichia coliSequence AlignmentAmino Acid Transport SystemsSaccharomyces cerevisiaeBinding SitesAmino Acid MotifsMutagenesis, Site-DirectedSequence Homology, Nucleic AcidKineticsGenes, EssentialPlasmidsRestriction MappingRecombinant ProteinsGene DeletionBacterial ProteinsLeucineSaccharomyces cerevisiae ProteinsGenes, BacterialCell LineProtein ConformationDNA, ComplementaryAmino Acids, AromaticProtein Structure, TertiaryGenes, FungalModels, MolecularProtein BindingAmino Acids, Branched-ChainStructure-Activity RelationshipPeptide FragmentsAmino Acids, SulfurGlutaminePeptidesRecombinant Fusion ProteinsOpen Reading FramesNitrogenSubstrate SpecificityConserved SequenceMutagenesisDNASequence Analysis, DNAMolecular WeightRNA, MessengerViral ProteinsMutagenesis, InsertionalProteinsFungal ProteinsPhylogenyGenetic Complementation TestSequence DeletionCarrier ProteinsDNA PrimersGenes, ViralSpecies SpecificityCattleLysineProtein Structure, SecondaryPhenotypeDietary ProteinsTranscription, GeneticProtein BiosynthesisAlanineGenesBiological TransportElectrophoresis, Polyacrylamide GelPolymerase Chain ReactionAmino Acid Transport Systems, BasicGene LibraryMembrane ProteinsSwineIsoleucineHerpesvirus 1, SuidAmino Acids, BasicDNA, BacterialArgininePhenylalanineVirus ReplicationCysteineEvolution, MolecularChromatography, High Pressure LiquidDNA-Binding ProteinsChromosome MappingTransfectionCodonDNA, ViralEscherichia coli ProteinsGene ExpressionCyanogen BromideTrypsinGlycineMultigene FamilyAmino Acids, Diamino