Receptors, NicotinicAmino AcidsSequence Homology, Amino AcidAmino Acid SequenceAmino Acid SubstitutionCloning, MolecularBinding SitesAmino Acids, EssentialMolecular Sequence DataStructure-Activity RelationshipModels, MolecularAmino Acid Transport SystemsKineticsSequence AlignmentBase SequenceMutationMutagenesis, Site-DirectedAmino Acid MotifsEscherichia coliProtein BindingRecombinant ProteinsSubstrate SpecificityProtein ConformationPeptide FragmentsDose-Response Relationship, DrugHormone AntagonistsExcitatory Amino Acid AntagonistsProtein Structure, TertiaryCell LineDopamine AntagonistsPeptidesDNA, ComplementaryNeurokinin-1 Receptor AntagonistsNarcotic AntagonistsAmino Acids, AromaticSequence Homology, Nucleic AcidRats, Sprague-DawleyHistamine H2 AntagonistsLeucineAmino Acids, Branched-ChainDNARNA, MessengerBinding, CompetitiveMuscarinic AntagonistsInterleukin 1 Receptor Antagonist ProteinAmino Acids, SulfurPiperidinesRecombinant Fusion ProteinsBacterial ProteinsProtein Structure, SecondaryGABA AntagonistsMolecular StructureLigandsAlanineMolecular WeightStereoisomerismGlycineProteinsRadioligand AssayPurinergic P1 Receptor AntagonistsHistamine H1 AntagonistsChromatography, High Pressure LiquidNicotinic AntagonistsSpecies SpecificityCells, CulturedCricetinaeRestriction MappingAdrenergic alpha-1 Receptor AntagonistsCarrier ProteinsHistamine AntagonistsPhylogenyCattleOligopeptidesTransfectionPurinergic P2 Receptor AntagonistsElectrophoresis, Polyacrylamide GelBiological TransportAdenosine A2 Receptor AntagonistsDNA PrimersSequence Analysis, DNARabbitsConserved SequenceRats, WistarTime FactorsLysineCHO CellsPlasmidsIsoleucineGlutamic AcidGenes, BacterialValineSerotonin 5-HT2 Receptor AntagonistsArginineNeuronsAspartic AcidMembrane ProteinsPoint MutationAmino Acid Transport Systems, BasicCalciumCell Membrane