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This antibody recognizes the same epitope as clone 2.4G2. All of the Fcγ receptors （FcγR） belong to the immunoglobulin superfamily and are the most important Fc receptors for inducing phagocytosis of opsonized （marked） microbes. This family includes several members, FcγRI （CD64）, FcγRIIA （CD32）, FcγRIIB （CD32）, FcγRIIIA （CD16a）, FcγRIIIB （CD16b）, which differ in their antibody affinities due to their different molecular structure. CD16/CD32 are expressed on natural killer cells, monocytes, macrophages, dendritic cells （at low levels）, Kupffer cells, granulocytes, mast cells, B lymphocytes, immature thymocytes, and some activated mature T lymphocytes.