Cells were lysed as previously described [30] (link). The following antibodies that follow were used: anti-Tag (Pab101, [84] (link)), anti-actin (I-19, Santa Cruz), anti-CHK1 (G-4, Santa Cruz), anti-CHK1 pS317 (Cell Signaling), anti-CHK2 pT68 (Y171, Epitomics), anti-CHK2 (EPR4325, Epitomics), anti-NBS1 pS343 (EP178, Epitomics), anti-NBS1 (A301-289A, Bethyl Laboratories), anti-ATR (N-19, Santa Cruz), anti-DNA-PKcs (G-4, Santa Cruz), anti-KU80 (C-20, Santa Cruz), anti-KU70 (M-19, Santa Cruz), anti-DNA-PKcs pS2056 (EPR5670, Epitomics), anti-CtIP (A300-488A, Bethyl Laboratories), and anti-GAPDH (0411, Santa Cruz).
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