Receptors, IgGReceptors, FcImmunoglobulin GBinding Sites, AntibodyAntigen-Antibody ComplexImmunologic CappingReceptors, IgEImmunoglobulin MImmunoglobulin EPeptide FragmentsMice, KnockoutCells, CulturedImmunoglobulin Fab FragmentsIgG DeficiencyMolecular Sequence DataPolymorphism, Restriction Fragment LengthImmunoglobulin FragmentsImmunoglobulin AImmunoglobulin Fc FragmentsBase SequenceAmino Acid SequenceEnzyme-Linked Immunosorbent Assay