Cell extracts were prepared and proteins were resolved by sodium dodecyl sulphate-polyacrylamide gel electrophoresis as described previously (47 (link),54 (link)). Rabbit anti-53BP1 were purchased from Novus and used at 1:1000 dilution. Mouse anti-BRCA1 (D-9, Santa Cruz) was used at 1:100 for western blotting. HA.11 clone 16B12 from Covance was used at 1:1000 for western blotting. Mre11 was used at 1:1000 for western blotting (Novus Biologicals). Secondary antibodies used were goat-anti-mouse IgG–horseradish peroxidase (HRP) conjugated, goat-anti-rabbit IgG–HRP conjugated at 1:2000 dilutions.
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