FCGR3A and Thrombocytopenia: Strikingly, the administration of IgG from patients with and without thrombocytopenia in human FcR knockin mice caused a significant drop in platelet counts in mice receiving IgG from the thrombocytopenia patients in an FcγRIIa- and FcγRIIIa-dependent manner (Wang et al. 2017).