While type I interferons are known to induce expression of ISGs such as IFIT1 and IFIT3 [20–22], we did not detect altered expression of interferon alpha-2 (IFNA2) or interferon beta-1 (IFNB1) within Tregs from ITP patients (Figure S4A). Here, IFNB1 is linked to autoimmune thrombocytopenic purpura.