Receptors, VirusMolecular Sequence DataAmino Acid SequenceHemagglutinin Glycoproteins, Influenza VirusReceptor Activity-Modifying Protein 1Receptor Activity-Modifying ProteinsReceptors, Cell SurfaceCloning, MolecularVirus AttachmentBinding SitesProtein BindingCricetinaeCHO CellsSpecies SpecificityCell LineLigandsBinding, CompetitiveBirdsModels, MolecularInfluenza in BirdsTransfectionInfluenza A Virus, H5N1 SubtypeBase SequenceCrystallography, X-RaySequence Homology, Amino AcidRadioligand AssayN-Acetylneuraminic AcidReceptors, G-Protein-CoupledRecombinant ProteinsProtein Structure, TertiaryReceptors, ImmunologicSequence AlignmentReceptors, SerotoninRecombinant Fusion ProteinsMutagenesis, Site-DirectedMutationProtein ConformationStructure-Activity RelationshipDNADNA, ComplementaryInfluenza, HumanSequence Homology, Nucleic AcidPolysaccharidesAmino Acid SubstitutionMembrane ProteinsKineticsPhylogenyProtein Structure, SecondaryGTP-Binding ProteinsAntibodies, MonoclonalDose-Response Relationship, DrugRNA, MessengerCell MembraneCyclic AMPSignal TransductionMembrane GlycoproteinsGene ExpressionPeptidesDNA PrimersRabbitsPhosphorylationGene Expression RegulationElectrophoresis, Polyacrylamide Gel