We used SV40-transformed Fanconi Anemia patient-derived FANCD2-deficient PD20 fibroblasts with or without complementation by His-tagged FANCD2; unrelated SV40-transformed fibroblasts GM639cc1, or primary fibroblasts (HFF4) and keratinocytes (HFK4) derived from the same healthy donor and depleted of FANCD2 (Figures 1A,B, S1A). The gene discussed is FANCD2; the disease is Fanconi anemia.