“…Immunoblotting was performed as previously described 15 using antibodies against USP1, USP2, USP5, USP7, USP14, Caspase-3/8/9, p21, FANCD2, FANCI, PCNA, Rad51, GAPDH (Cell Signaling, Beverly, MA, USA); ID1, ID2, ID3, ID4, Notch-1, Notch-2, Sox-4 and Sox-2 (Bethyl Laboratories, Montgomery, TX, USA).…”