Receptors, NicotinicAmino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularAmino Acids, EssentialAmino Acid Transport SystemsSequence AlignmentBase SequenceBinding SitesHormone AntagonistsAmino Acid MotifsPeptide FragmentsMolecular Sequence DataMutationExcitatory Amino Acid AntagonistsEscherichia coliKineticsMutagenesis, Site-DirectedDopamine AntagonistsStructure-Activity RelationshipRecombinant ProteinsNeurokinin-1 Receptor AntagonistsDNA, ComplementaryDose-Response Relationship, DrugModels, MolecularNarcotic AntagonistsProtein ConformationAmino Acids, AromaticSequence Homology, Nucleic AcidHistamine H2 AntagonistsProtein BindingPeptidesAmino Acids, Branched-ChainCell LineLeucineInterleukin 1 Receptor Antagonist ProteinAmino Acids, SulfurProtein Structure, TertiaryRNA, MessengerMuscarinic AntagonistsRats, Sprague-DawleyDNASubstrate SpecificityGABA AntagonistsMolecular WeightHistamine H1 AntagonistsPiperidinesBacterial ProteinsPurinergic P1 Receptor AntagonistsRecombinant Fusion ProteinsAlanineRestriction MappingProteinsGlycineNicotinic AntagonistsHistamine AntagonistsPhylogenyBinding, CompetitiveSequence Analysis, DNAAdenosine A2 Receptor AntagonistsPurinergic P2 Receptor AntagonistsCarrier ProteinsSpecies SpecificityElectrophoresis, Polyacrylamide GelProtein Structure, SecondaryAdrenergic alpha-1 Receptor AntagonistsGenes, BacterialCells, CulturedChromatography, High Pressure LiquidDNA PrimersPlasmidsCattleConserved SequenceAmino Acid Transport Systems, BasicRats, WistarValineLysineIsoleucineSerotonin 5-HT3 Receptor AntagonistsOligopeptidesRabbitsSerotonin 5-HT2 Receptor AntagonistsAmino Acids, BasicCricetinaeBiological TransportTransfectionGlutamic AcidArginineExcitatory Amino AcidsAspartic AcidCodonAdenosine A1 Receptor AntagonistsGlutamineTrypsinTime FactorsLeukotriene AntagonistsGene ExpressionAngiotensin Receptor Antagonists