(K) The PARylation of KLF4 was increased after exposure to DNA damage. KLF4 complex was purified using immunoprecipitation from MDA-MB-231 cells that were treated with 5 µM doxorubicin and were then collected at different times (1h, 2h, 4h and 8h). PARylation was detected by using antibody against PAR. 