Complement C4bComplement Inactivator ProteinsBinding SitesProtein BindingMolecular Sequence DataBinding, CompetitiveAmino Acid SequenceModels, MolecularKineticsBase SequenceProtein Structure, TertiaryProtein ConformationMutagenesis, Site-DirectedPromoter Regions, GeneticCell LineTranscription FactorsRecombinant ProteinsMutationLigandsDNA-Binding ProteinsStructure-Activity RelationshipEscherichia coliPeptide FragmentsAffinity LabelsBinding Sites, AntibodyTranscription, GeneticCattleSequence Homology, Amino AcidCrystallography, X-RayCell MembraneDNACarrier ProteinsMacromolecular SubstancesRecombinant Fusion ProteinsSequence AlignmentRadioligand AssayProtein Structure, SecondaryReceptors, Cell SurfaceComplement C3bAntibodies, MonoclonalBacterial ProteinsPeptidesRabbitsCalciumSpectrometry, FluorescenceTransfectionElectrophoresis, Polyacrylamide GelCells, CulturedNucleic Acid ConformationCloning, MolecularCross-Linking ReagentsAdenosine TriphosphateConsensus SequenceGene Expression RegulationEpitopesMagnetic Resonance SpectroscopyMagnesiumMolecular WeightSubstrate SpecificityAzidesAllosteric RegulationModels, BiologicalNuclear ProteinsDose-Response Relationship, DrugIodine RadioisotopesPlasmidsAdenosine DiphosphateSurface Plasmon ResonanceConserved SequenceAllosteric SiteHydrogen-Ion ConcentrationCricetinaeAmino Acid MotifsMutagenesisRNA, MessengerMembrane ProteinsAmino Acid SubstitutionPhotoaffinity LabelsMolecular StructureProteinsRepressor ProteinsDNA FootprintingPeptide MappingDNA PrimersDimerizationModels, ChemicalEnhancer Elements, GeneticPhosphorylationHeLa CellsChickensTrypsinCHO CellsOligopeptidesBungarotoxinsTumor Cells, CulturedTorpedoTranscriptional ActivationPhotochemistrySequence DeletionTemperature