Background:GTPase-activating protein for the ADP ribosylation factor family(Potential). Binds phosphatidylinositol 3,4,5-trisphosphate(PtdInsP3) and inositol 1,3,4,5-tetrakisphosphate(InsP4). Possesses a stoichiometry of two binding sites for InsP4 with identical affinity.