title: IgG2 deficiency in autoimmune cytopenias.
mesh_terms: D000328:Adult; D001327:Autoimmune Diseases / Q000150:complications / Q000276:immunology*; D002648:Child; D006801:Humans; D007074:Immunoglobulin G / Q000145:classification / Q000235:genetics*; D011696:Purpura, Thrombocytopenic / Q000150:complications / Q000276:immunology*
chemical_list: D007074:Immunoglobulin G