Collectively, these germline LOF IKZF2 variants were predominantly heterozygous (10/13) and were mostly associated with evidence of immune dysregulation (10/13) (Table S4), including systemic lupus erythematosus (SLE), hemophagocytic lymphohistiocytosis (HLH), idiopathic thrombocytopenic purpura (ITP), and Evan’s syndrome. Here, IKZF2 is linked to hemophagocytic syndrome.