Immunoblot analysis was performed as described in detail previously [21 (link),22 (link)]. Primary antibodies against ATM (Bethyl Laboratories, Montgomery, TX, USA), phospho-ATM Ser1981 (Cell Signaling Technologies, Danvers, NJ, USA), ATR (Bethyl Laboratories), phospho-ATR Ser428 (Cell Signaling Technologies), p53 (Cell Signaling Technologies), phospho-p53 Ser15 (Cell Signaling Technologies), SMC1 (Bethyl Laboratories), phospho-SMC1 Ser966 (Bethyl Laboratories), Chk1 (G-4; Santa Cruz Biotechnology, Santa Cruz, CA, USA), phospho-Chk1 Ser317 (Bethyl Laboratories), phospho-Chk1 Ser345 (Cell Signaling Technologies), Chk2 (H-300; Santa Cruz), phospho-Chk2 Thr68 (Cell Signaling Technologies), Wip1 (PPM1D; Bethyl Laboratories), Cdc25A (F-6; Santa Cruz) and GAPDH (Cell Signaling Technologies) were used for immunoblots.
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