Four representative experiments are shown. The α-γ-γ chimera contains the EC of the FcγRIIIA α chain and the TM and CYT domains of the FcγRIIIA γ chain. B1 and B2 minimally inhibited α-γ-γ phagocytosis. Cell-surface expression of α-γ-γ was similar within each experiment and was not reduced by the expression of FcγRIIB. α-FcγRIII, anti-FcγRIII (recognizes α-γ-γ), α-FcγRII, anti-FcγRII (recognizes FcγRIIB).