*4.2. Antibodies*

The following primary antibodies were used for immunoblotting and immunofluorescence: Cleaved form of caspase-3 (#9662S), phospho-AKT S473 (#4060P), AKT (#4691P), phospho-histone H2A.X Ser139 (#9718S) (Cell Signaling, Danvers, MA, USA), PARP (#436400) (Life Technologies, Carlsbad, CA, USA), γ-H2AX S139 (sc-517348), Rad51 (sc-8349) (Santa Cruz Biotechnology, Santa Cruz, CA, USA), Rad51 (ab-133534, Abcam, Burlingame, CA, USA), phosphor-RPA32 Ser4/8 (A300-245)(Bethyl Laboratories, Montgomery, TX, USA), beta-actin (A00730-200, Gene Script, Piscataway, NJ, USA), HRP-conjugated secondary antibodies for Western blotting were purchased from Santa Cruz Biotechnology (Santa Cruz, CA, USA) and Alexa Fluor 488- or Texas Red-conjugated secondary antibodies for immunofluorescence staining were obtained from Invitrogen (Carlsbad, CA, USA).
