ART5 and severe combined immunodeficiency due to DCLRE1C deficiency: In addition to DDR, we investigated the expression of T cell receptor alpha V7.2 (TCRaV7.2) on CD45+CD3+ T cells of all patients analyzed, including an additional patient with ARTEMIS deficiency and maternal–fetal T cell transfusion (ART5), and 21 healthy controls (Fig. 4, Figure S2).