Amino Acid Transport System AAmino Acid Transport SystemsAmino Acid Transport System LPlacentaTrophoblastsAmino AcidsMaternal-Fetal ExchangeFetal Growth RetardationPregnancyTOR Serine-Threonine KinasesSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialSequence AlignmentAmino Acid MotifsBase SequenceEscherichia coliMutationBinding SitesMutagenesis, Site-DirectedDNA, ComplementaryAmino Acids, AromaticSequence Homology, Nucleic AcidMolecular Sequence DataAmino Acids, Branched-ChainPeptide FragmentsAmino Acids, SulfurKineticsRecombinant ProteinsLeucineProtein ConformationModels, MolecularStructure-Activity RelationshipProtein Structure, TertiarySubstrate SpecificityDNAMolecular WeightPeptidesProtein BindingBacterial ProteinsRestriction MappingCell LinePhylogenyAlanineRecombinant Fusion ProteinsSequence Analysis, DNAGenes, BacterialProteinsElectrophoresis, Polyacrylamide GelRNA, MessengerAmino Acid Transport Systems, BasicProtein Structure, SecondaryPlasmidsConserved SequenceIsoleucineAmino Acids, BasicLysineSpecies SpecificityChromatography, High Pressure LiquidDNA PrimersCarrier ProteinsCodonCyanogen BromideTrypsinGlycineCattleBiological TransportAmino Acids, DiaminoGlutamineOpen Reading FramesGenesValineProtein BiosynthesisExcitatory Amino AcidsMethionineArginineAspartic AcidGene LibrarySaccharomyces cerevisiaeSequence DeletionSequence AnalysisPolymerase Chain ReactionNitrogenProlinePhenylalaninePoint MutationMutagenesisAmino Acids, NeutralCysteineTryptophanTransfectionTranscription, GeneticMembrane ProteinsDNA, BacterialBlotting, NorthernMacromolecular SubstancesEvolution, MolecularSequence Analysis, Protein