Cell extracts were isolated using RIPA lysis method and westerns were performed as described previously (34). Primary antibodies were used at 1:1000 according to manufacturer specifications. Primary antibodies include: MYBL2 (Millipore #MABE886), CHK1 (Novus Biologicals #NB100-464), αTubulin (Sigma-Aldrich #T9026), γH2AX pS139 (Cell Signaling #9718), and H2AX (Cell Signaling #7631). Secondary antibodies conjugated to HRP include anti-rabbit IgG (Cell Signaling #7074) and anti-mouse IgG (Cell Signaling #7076). Secondary antibodies were used at 1:2500. Densitometric analyses were performed on autoradiographs and fold change relative to tubulin loading control was calculated using NIH ImageJ 1.46r software.
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