Amino AcidsAmino Acid Transport SystemsReceptors, Purinergic P2X1LeucineSequence Homology, Amino AcidVitamin AVitaminsVitamin DVitamin EAmino Acid SequenceAmino Acid SubstitutionVitamin B 12Cloning, MolecularVitamin A DeficiencyAmino Acids, EssentialVitamin D DeficiencySequence AlignmentBase SequenceAmino Acid MotifsEscherichia coliMutationBinding SitesMolecular Sequence DataKineticsMutagenesis, Site-DirectedVitamin K 1DNA, ComplementaryAmino Acids, AromaticSequence Homology, Nucleic AcidVitamin B 6Peptide FragmentsRecombinant ProteinsAmino Acids, Branched-ChainProtein ConformationVitamin E DeficiencyModels, MolecularVitamin B 12 DeficiencyAmino Acids, SulfurStructure-Activity RelationshipSubstrate SpecificityProtein Structure, TertiaryDNAMolecular WeightProtein BindingPeptidesBacterial ProteinsCell LineRestriction MappingChromatography, High Pressure LiquidPhylogenyVitamin K DeficiencyAlanineSequence Analysis, DNAElectrophoresis, Polyacrylamide GelRNA, MessengerProteinsVitamin B 6 DeficiencyRecombinant Fusion ProteinsGenes, BacterialAmino Acid Transport Systems, BasicAscorbic AcidProtein Structure, SecondaryCholecalciferolAmino Acids, NeutralSpecies SpecificityPlasmidsCarrier ProteinsCattleConserved SequenceBiological TransportLysineIsoleucineDNA PrimersDietary SupplementsAmino Acids, BasicCodonMethionineTrypsinGlycineAmino Acids, DiaminoCyanogen BromideGlutamineHydrogen-Ion ConcentrationGenesArginineOpen Reading FramesValineProtein BiosynthesisPolymerase Chain ReactionNitrogenAspartic AcidSaccharomyces cerevisiaeLiverNeutral RedVitamin D-Binding ProteinPhenylalanineSequence DeletionTryptophanProlineReceptors, Calcitriol